User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0 Build ID: 20160604131506 Steps to reproduce: 1. Clear app-data. 2. Install the following add-ons: https://addons.mozilla.org/en-US/firefox/addon/userunified-script-injector/ https://addons.mozilla.org/en-US/firefox/addon/speed-tweaks-speedyfox/ https://addons.mozilla.org/en-US/android/addon/tap-translate/ https://addons.mozilla.org/en-US/android/addon/html5-video-everywhere/?src=ss https://noscript.net/nsa/latest 3. Create a few scripts with the USI add-on or change some settings with other add-ons. 4. Enable Clear private data on exit (Settings > Privacy > Clear private data on exit > check all > OK). 5. Quit Firefox (Menu > Quit) If you can't cause it to happen right away, play around with it a bit. Actual results: Quiting Firefox will result in data loss, add-on data won't save and recently removed add-ons/themes come back. Expected results: Add-on data should be saved along with anything else that needs to be saved. I spent a good hour playing around with this both using the standard version of Firefox along with the beta version, both seem to have this issue.

At first, I thought this may have been an add-on specific issue, but after having Firefox restore some add-ons and themes that I removed after I quit, I believe it may be a browser issue that may have something to do with having multiple add-ons. I'm using a Galaxy Note 3 on Android 5.0 using the latest version of Firefox for Android (v. 48).

Not a duplicate, still an issue in version 49.0.2 of Firefox for Android.