Created attachment 8762095 [details] about newtab opened instead of AS new tab.mp4 [Affected versions]: - Firefox 45.0 and up - Activity Stream 1.0.19-dev [Affected Platforms]: - All Windows - All Mac OS - All Linux [Prerequisites]: - Latest Activity Stream add-on version (1.0.19-dev) was previously installed on a clean profile. [Steps to reproduce]: 1. Start Firefox browser with the profile where Activity Stream add-on was previously installed. 2. As soon as the browser window appears, open a "New Tab" page as fast as possible (spam click on new tab button could help too). 3. Observe the "New Tab" page content. [Expected results]: Opened "New Tab" page has the Activity Stream content displayed. [Actual results]: Opened "New Tab" page has the default browser content displayed (old tiles). [Notes]: - This is a very edge case, the reproducibility rate depends on catching the right moment to open the new tab. Probably it occurs before AS add-on is initiated. - Attached screen recording with the issue.
Filed in GitHub as https://github.com/mozilla/activity-stream/issues/837
This issue cannot be fixed in the current version of Activity Stream add-on. It will be fixed when the add-on gets into Gecko. Leave issue as NEW for tracking purpose.
This is fixed in the system-addon, as the pref overrides the New Tab page completely.