Mozilla is collecting a dataset of in-page pop-ups created in HTML.  These are pop-ups that pages open at various times, such as upon load, scrolling, inactivity, switching away or back to a tab, etc.  We appreciate your help in collecting the dataset by submitting the URL of pages where such pop-ups can be found  You can find an example screenshot below.  The resulting dataset will be made available under the CC BY 4.0 (Creative Commons Attribution 4.0 International) license.