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Klar + GeckoViewKlar + Chromium WebViewFirefox Nightly + Tracking DisabledFirefox Nightly + Tracking EnabledKlar + Chromium WebViewKlar + GeckoViewFirefox Nightly + Tracking DisabledFirefox Nightly + Tracking Enabled
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Samsung Galaxy S8 (Android 7.0) Pixel 2 (Android 8.0.1)
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Visual Comparison of Top Mobile Sites: mark with Pass if no issues; leave a comment if you notice an issue on Klar compared to one of the other apps
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Wikia.compasspasspasspass
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Buzzfeed.compasspasspasspass
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Yelp.depasspasspasspass
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Eurosport.eupasspasspasspass
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Ranker.compasspasspasspass
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Performance Comparison: mark down the load time for each app
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First startup after a fresh install
In Android Studio, open the logcat and filter it by the keyword "Displayed". That will be the time the app took to open.

E.g: /ActivityManager: Displayed org.mozilla.focus.gecko.debug/org.mozilla.focus.activity.MainActivity: +259ms
Displayed org.mozilla.focus.gecko.debug/org.mozilla.focus.activity.MainActivity: +835msDisplayed org.mozilla.klar/org.mozilla.focus.activity.MainActivity: +739msDisplayed org.mozilla.fennec_aurora/org.mozilla.gecko.BrowserApp: +468ms (total +572ms)/
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Cold app startup

This is the first startup after rebooting the phone.
In Android Studio, open the logcat and filter it by the keyword "Displayed". That will be the time the app took to open.Displayed org.mozilla.focus.gecko.debug/org.mozilla.focus.activity.MainActivity: +572ms (total +11s616ms)Displayed org.mozilla.klar/org.mozilla.focus.activity.MainActivity: +274msDisplayed org.mozilla.fennec_aurora/org.mozilla.gecko.BrowserApp: +363ms (total +413ms)Displayed org.mozilla.fennec_aurora/org.mozilla.gecko.BrowserApp: +561ms (total +628ms)
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Warm app startup

Force stop the app and re-launch
In Android Studio, open the logcat and filter it by the keyword "Displayed". That will be the time the app took to open.Displayed org.mozilla.focus.gecko.debug/org.mozilla.focus.activity.MainActivity: +330msDisplayed org.mozilla.klar/org.mozilla.focus.activity.MainActivity: +262msDisplayed org.mozilla.fennec_aurora/org.mozilla.gecko.BrowserApp: +335ms (total +460ms)Displayed org.mozilla.fennec_aurora/org.mozilla.gecko.BrowserApp: +358ms (total +460ms)
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Page load time

Approximate “stopwatch time” for page load times (the time between pressing load and when the “above-the-fold” portion of page has completed drawing) of the following pages from the top mobile sites:
Wikia.com05.1s - cold run after turning on the phone
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03.5s - warmed up
03.24s cold run
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03.0s warmed up
06.3s 0.48s
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Buzzfeed.com04.0s
vs
02.0s
02.6s
vs
01.4s
03.3s01.7s
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Yelp.de03.8s
vs
02.7s
03.1s
vs
02.0s
01.7s01.6s
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Eurosport.eu
05.2s
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02.8s
04.4s
vs
03.8s
04.9s03.0s
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Ranker.com2.9
vs
02.6s
02.5s
vs
02.1s
02.2s01.5s
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Run the Focus Smoke test suite on the Klar + GeckoView app:
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Test suite ->https://testrail.stage.mozaws.net/index.php?/suites/view/1028
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