Great WebExtensions on AMO
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WebExtensionurloverviewcategorylegacy content it could replace...
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YouTube Subtitle Downloaderhttps://addons.mozilla.org/en-US/firefox/addon/youtube-subtitle-downloader/Download closed captions from YouTube. Accessibility
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Todohttps://addons.mozilla.org/en-US/firefox/addon/todo/Simple to-do/prioritization listAlerts & Updates
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Reddit Slate Nights 2.0https://addons.mozilla.org/en-US/firefox/addon/reddit-slate-nights-2-0-dark/Dark themeAppearance
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Dark YouTube Themehttps://addons.mozilla.org/en-US/firefox/addon/dark-youtube-theme/Dark themeAppearance
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YouTube Dark Modehttps://addons.mozilla.org/en-US/firefox/addon/youtube-dark-mode/Dark themeAppearance
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Dark Purple YouTube Themehttps://addons.mozilla.org/en-US/firefox/addon/youtube-dark-purple/Dark themeAppearance
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Turn Off the Lightshttps://addons.mozilla.org/en-US/firefox/addon/turn-off-the-lights/Turns everything dark ala cinema modeAppearance
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Dark Modehttps://addons.mozilla.org/en-US/firefox/addon/dark-mode-webextension/Universal dark modeAppearance
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New Tab to about:homehttps://addons.mozilla.org/en-US/firefox/addon/new-tab-to-about-home/Set your own custom new tab home page. AppearanceNew Tab Override
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Zoom Page WEhttps://addons.mozilla.org/en-US/firefox/addon/zoom-page-we/
Zoom web pages (either per-site or per-tab) using full-page zoom, text-only zoom, automatic fit-to-width and minimum font size.
AppearanceZoom Page
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Ideal Sizehttps://addons.mozilla.org/en-US/firefox/addon/ideal-size/
Resize the window to the most ideal size for the page you are on
Appearance
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Theater Modehttps://addons.mozilla.org/en-US/firefox/addon/theater-mode/Put any video into theater mode. Appearance
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Print Edit WEhttps://addons.mozilla.org/en-US/firefox/addon/print-edit-we/
Provides facilities to edit the contents of a web page prior to printing or saving. Elements in the web page can be formatted, hidden or deleted and text can be edited or inserted.
AppearancePrint Edit
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Emoji Boxhttps://addons.mozilla.org/en-US/firefox/addon/emoji-box/Appearance
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Twitter as a Sidebarhttps://addons.mozilla.org/en-US/firefox/addon/twitter-as-a-sidebar/Appearance
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Mobile Wikipediahttps://addons.mozilla.org/en-US/firefox/addon/mobile-wikipedia-webextension/Appearancem-wiki
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OneNote Web Clipperhttps://addons.mozilla.org/en-US/firefox/addon/onenote-clipper/Save things on the Web, organize them; good for students.Bookmarks
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LinkLockerhttps://addons.mozilla.org/en-US/firefox/addon/linklocker-private-bookmarking/Bookmarks
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Dynamic Bookmarkshttps://addons.mozilla.org/en-US/firefox/addon/dynamic-bookmarks/Bookmarks
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Hypershoothttps://addons.mozilla.org/en-US/firefox/addon/hypershoot-bookmarks/Capture full page screengrabs of fave sites and organize them.Bookmarks
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Pinboard Bookmarkhttps://addons.mozilla.org/en-US/firefox/addon/pinboard-bookmark/Bookmarks
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Save to Bookmark OShttps://addons.mozilla.org/en-US/firefox/addon/bookmarkos/Really robust bookmarking options.Bookmarks
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Bookmarks Manager and Viewerhttps://addons.mozilla.org/en-US/firefox/addon/bookmarks-manager-and-viewer/Bookmarks
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Page Memohttps://addons.mozilla.org/en-US/firefox/addon/page-memo/Leave yourself post-it notes on any web page. EducationBookmarks
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Speed Dial (Lite)https://addons.mozilla.org/en-US/firefox/addon/speed-dial-lite/
Access to your favorite websites via an stylish speed dial.
Bookmarks
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YouTube Downloader Litehttps://addons.mozilla.org/en-US/firefox/addon/youtube-downloader-lite/DL mgt
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Video Downloader Primehttps://addons.mozilla.org/en-US/firefox/addon/video-downloader-prime/DL most video formats; featuredDL mgt
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Mp3 Converterhttps://addons.mozilla.org/en-US/firefox/addon/mp3converter/Convert and download vids from YT into MP3 and MP4 formatsDL mgt
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Bulk Media Downloaderhttps://addons.mozilla.org/en-US/firefox/addon/bulk-media-downloader/Grabs and downloads all sort of media resources in bulk. DL mgt
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Easy YouTube Video Downloader Expresshttps://addons.mozilla.org/en-US/firefox/addon/easy-youtube-video-download/DL mgt
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SaveFrom.net helper all-in-1 / youtube downloaderhttps://addons.mozilla.org/en-US/firefox/addon/savefromnet-helper/Stil experimental, but very powerful downloaderDL mgt
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HD YouTube Downloaderhttps://addons.mozilla.org/en-US/firefox/addon/hd-youtube-downloader/Download youtube videos in a new tab page.DL mgt
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YouTube Video Downloadhttps://addons.mozilla.org/en-US/firefox/addon/youtube-video-download/?src=collection&collection_id=84eba2c6-cf25-41dc-9d0c-fcefb1030b88DL mgt
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YouTube-mp3.to MP3 Converterhttps://addons.mozilla.org/en-US/firefox/addon/youtube-video-to-mp3-converter/
Adds a lightweight button below YouTube videos. This button converts the corresponding video of youtube to mp3 instantly when clicked.
DL mgt
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EasyLoadhttps://addons.mozilla.org/en-US/firefox/addon/easyload/
download video or audio from any site – simply provide us the link
DL mgt
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Facebook Video Downloaderhttps://addons.mozilla.org/en-US/firefox/addon/fb-video-5download-com/DL mgt
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YouTube Video and Audio Downloaderhttps://addons.mozilla.org/en-US/firefox/addon/youtube_downloader_webx/
Download YouTube videos in all available formats and extract the original audio files.
DL mgt.
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YouTube and More - Easy Video Downloaderhttps://addons.mozilla.org/en-US/firefox/addon/video-downloader-pure/DL mgt
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YouTube Video and Audio Downloaderhttps://addons.mozilla.org/en-US/firefox/addon/youtube_downloader_webx/
Download YouTube videos in all available formats and extract the original audio files
DL mgt
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Tab2QRhttps://addons.mozilla.org/en-US/firefox/addon/tab2qr/
Send the page you are currently viewing to your mobile device.
Feeds/News/Blogging
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Reading Listhttps://addons.mozilla.org/en-US/firefox/addon/readinglist/Save and read later. Feeds/News/Blogging
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Tranquility Readerhttps://addons.mozilla.org/en-US/firefox/addon/tranquility-1/Nice web readerFeeds/News/Blogging
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Unvisit Plushttps://addons.mozilla.org/en-US/firefox/addon/unvisitplus/
Read news, articles, blogs and posts - without giving the page a visit.
Feeds/News/Blogging
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Disable Facebook Newsfeedhttps://addons.mozilla.org/en-US/firefox/addon/disable-facebook-news-feed/
Removes news feed from Facebook. Saves hours of scrolling.
Feeds/News/Blogging
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Amazing TTVhttps://addons.mozilla.org/en-US/firefox/addon/amazing-ttv/Fancy Twitch tool that allows for dozens of customizations, like altering text and color layouts, removing clutter in the margins, and tweaking the chat experience.Games/Entertainment
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YouTube Popout Playerhttps://addons.mozilla.org/en-US/firefox/addon/youtube-popout-player/Simple way to pop out a YT clipGames/Entertainment
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Remove YouTube Recomendedshttps://addons.mozilla.org/en-US/firefox/addon/remove-youtube-recommendeds/Reove reomdended YouTube content. Games/Entertainment
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Better Twitch Chathttps://addons.mozilla.org/en-US/firefox/addon/better-twitch-chat/Games/Entertainment
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Page Translatorhttps://addons.mozilla.org/en-US/firefox/addon/jxl-page-translator/Translates entire page; icon only appears if page is in a foreign language.Language Support
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To Google Translatehttps://addons.mozilla.org/en-US/firefox/addon/to-google-translate/featured; solid translation toolLanguage Support
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Instant Translate: Select and Translatehttps://addons.mozilla.org/en-US/firefox/addon/instant-translate/translate words and phrases between 100+ languages; text-to-speechLanguage Support
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Translate Nowhttps://addons.mozilla.org/en-US/firefox/addon/translate-now/Language Support
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LanguageTool Grammar Checkerhttps://addons.mozilla.org/en-US/firefox/addon/languagetool/
Finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.
Language Support
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EPUBreaderhttps://addons.mozilla.org/en-US/firefox/addon/epubreader/
With EPUBReader you can read ePub files just in Firefox. No additional software needed!
Language Support
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RasTeck TTS Readerhttps://addons.mozilla.org/en-US/firefox/addon/rasteck-tts-reader/Language Support
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Copyfishhttps://addons.mozilla.org/en-US/firefox/addon/copyfish-ocr-software/Very cool and unique function! Extract text from images, videos or PDF's. Language Support
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Grammarlyhttps://addons.mozilla.org/en-US/firefox/addon/grammarly-1/Education. Adding Grammarly to Firefox means that your spelling and grammar will be vetted on Gmail, Facebook, Twitter, Linkedin, Tumblr, and nearly everywhere else you write on the web.Language Support
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Word Document Editorhttps://addons.mozilla.org/en-US/firefox/addon/word-editor/new tab as a Word doc; save and print files, etc. everything normal Word does; made by officeonlinesystemsOther
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Open Office Writer online documentshttps://addons.mozilla.org/en-US/firefox/addon/openoffice-writer-online/officeonlinesystemsOther
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LibreOffice Editorhttps://addons.mozilla.org/en-US/firefox/addon/libreoffice-editor-xls-doc-ppt/officeonlinesystemsOther
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Excel XLS Editorhttps://addons.mozilla.org/en-US/firefox/addon/excel-xls-editor/officeonlinesystemsOther
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Gimp online image editorhttps://addons.mozilla.org/en-US/firefox/addon/gimp-online-editor/officeonlinesystemsOther
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Wayback Machinehttps://addons.mozilla.org/en-US/firefox/addon/wayback-machine_new/Detects dead pages, 404s, DNS failures & a range of other web breakdowns, offering to show archived versions via the Internet Archive's Wayback MachineOther
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Quick Compose for Gmailhttps://addons.mozilla.org/en-US/firefox/addon/quick-compose-for-gmail/Toolbar button opens Gmail in new tabOther
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Enable Right Click and Copyhttps://addons.mozilla.org/en-US/firefox/addon/enable-rightclick-and-copy/Prevents websites from disabling various copying flows.Other
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Note Takerhttps://addons.mozilla.org/en-US/firefox/addon/note-taker/Simple note-taking tool built into toolbar. Other
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Gesturefyhttps://addons.mozilla.org/en-US/firefox/addon/gesturefy/
perform a bunch of actions through custom mouse gestures while holding the right mouse button.
Other
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FoxyGestureshttps://addons.mozilla.org/en-US/firefox/addon/foxy-gestures/Other
FireGestures, Mouse Gesture Suite, smartUP Gestures
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Web Clipper: Easy Screenshothttps://addons.mozilla.org/en-US/firefox/addon/web-clipper-easy-screenshot/Port of SDK version. Standard screen grabber (3 modes)Photos/Music/Videos
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TuneYouRadio Apphttps://addons.mozilla.org/en-US/firefox/addon/tuneyou-radio-app/Dozens of stations, news, sports, very internationalPhotos/Music/Videos
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Awesome Screenshot Plushttps://addons.mozilla.org/en-US/firefox/addon/screenshot-capture-annotate/Best, most popular screen shooterPhotos/Music/Videos
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YouTube Flash-HTML5play YT Videos in Flash or HTML5 player; featuredPhotos/Music/Videos
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Flash Player for YouTubehttps://addons.mozilla.org/en-US/firefox/addon/flash-player-for-youtube/Photos/Music/Videos
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Media Player for YouTubehttps://addons.mozilla.org/en-US/firefox/addon/media-player/provides a comprehensive player UI to allow you to control YouTube playback through Firefox toolbar panel; useful if you're watching YouTube while reading other websitesPhotos/Music/Videos
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Albumhttps://addons.mozilla.org/en-US/firefox/addon/photo-album/
detects the images on the current page and shows them in a list that can be exported in three different formats: 1) A simple list of absolute URLs pointing at the images; 2) An HTML snippet with "img" tags forming a mosaic. Images can also export their original links; 3) An HTML snippet that creates a carousel of images powered by Galleria.io (http://galleria.io)
Photos/Music/Videos
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Watch Laterhttps://addons.mozilla.org/en-US/firefox/addon/watch-later-easier/It's like a read later list but for videos. Photos/Music/Videos
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YouTube Audiohttps://addons.mozilla.org/en-US/firefox/addon/youtube-audio/Stream audio only, save bandwidthPhotos/Music/Videos
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Web to PDFhttps://addons.mozilla.org/en-US/firefox/addon/web-to-pdf/Save curent web page to a PDF filePhotos/Music/Videos
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Magic Actions for YouTubehttps://addons.mozilla.org/en-US/firefox/addon/magic-actions-for-youtube/Very popular; YT enhancer presents a fine bevy of features, like auto-play in HD, one-click snapshots of just the contents of the video screen, annotation muting, plus a bunch of fun visual effects and cinema modes.Photos/Music/Videos
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One-click Screenshothttps://addons.mozilla.org/en-US/firefox/addon/one-click-screenshot/Take screenshots of entire web pagesPhotos/Music/Videos
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Stencilhttps://addons.mozilla.org/en-US/firefox/addon/stencil-for-firefox/Diverse creativity tool that allows you to combine text and imagery in all sorts of imaginative waysPhotos/Music/Videos
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Pick & Save Imageshttps://addons.mozilla.org/en-US/firefox/addon/picknsave/Photos/Music/Videos
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SCDL SoundCloud Downloaderhttps://addons.mozilla.org/en-US/firefox/addon/scdl-soundcloud-downloader/DL tool that adds artwork, artist name, genre, other meta info in addition to sound filePhotos/Music/Videos
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Smart HTTPS (revived)https://addons.mozilla.org/en-US/firefox/addon/smart-https-revived/Automatically changes HTTP addresses to the secure HTTPS. ++Privacy/Security
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Popup Blocker (Lite)https://addons.mozilla.org/en-US/firefox/addon/popup-blocker-lite/Good, but as of March '17 still needs some polishPrivacy/Security
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Popup Blocker (strict)https://addons.mozilla.org/en-US/firefox/addon/popup-blocker/Privacy/Security
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History Cleanerhttps://addons.mozilla.org/en-US/firefox/addon/history-cleaner/Wipes browsing history after set amount of timePrivacy/Security
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History Zebrahttps://addons.mozilla.org/en-US/firefox/addon/history-zebra/Wipes history of sites on your white/black list; conveniently automatically handles all subdomains (e.g. everything under google.com); Privacy/Security
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Advanced Historyhttps://addons.mozilla.org/en-US/firefox/addon/advanced-history/Visual overview of your web nav historyPrivacy/Security
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Block Sites https://addons.mozilla.org/en-US/firefox/addon/block-site-2/Right-click on any Web page you want to avoid in the future and select “Block this domain” from the context menuPrivacy/Security
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Googley Eyeshttps://addons.mozilla.org/en-US/firefox/addon/googley-eyes/Elegantly informs you which sites you visit send information about you to GooglePrivacy/Security
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Search Engine Ad Removerhttps://addons.mozilla.org/en-US/firefox/addon/searchengineadremover/Removes ads when using search engines like google, bing, DuckDuckGo, Start Page, Ask Privacy/Security
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Ghosteryhttps://addons.mozilla.org/en-US/firefox/addon/ghostery/Privacy/Security
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Webmail Ad Blockerhttps://addons.mozilla.org/en-US/firefox/addon/webmail-ad-blocker/Block periphery ads on webmail clients like Gmail, Hotmail, Yahoo, etc; featured Privacy/Security
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AdBocker for YouTubehttps://addons.mozilla.org/en-US/firefox/addon/adblock-for-youtube/Privacy/Security
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Google search link fixhttps://addons.mozilla.org/en-US/firefox/addon/google-search-link-fix/Google and Yandex search pages have the annoying habit of changing the result link when you click it. So if you right-click the link in order to copy it you get some gibberish instead of what you wanted. This extension disables that behavior; as an added bonus, the search engine can no longer track your clicks; featuredPrivacy/Security
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Privacy Badgerhttps://addons.mozilla.org/en-US/firefox/addon/privacy-badger17/Automatically blocks spying ads and invisible trackers, to ensure that companies can't track your browsing without your consentPrivacy/Security
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Ads Cleanerhttps://addons.mozilla.org/en-US/firefox/addon/ads-cleaner/Removes search related ads for most major search enginesPrivacy/Security
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Disconnecthttps://addons.mozilla.org/en-US/firefox/addon/disconnect/Hugely popular... Visualize and block the otherwise invisible websites that track your search and browsing history. named the best privacy tool by the New York Times (2016), Innovation Award winner for Best Privacy and Security software at South by Southwest (2015), listed as one of the 100 best innovations of the year by Popular Science and one of the 20 best Chrome extensions by Lifehacker.
Privacy/Security
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