Hi,

'Don't know which add-ons you're using that haven't been migrated to Webextensions by their developers - you could contact those developers, or look for alternatives :

https://addons.mozilla.org/en-US/firefox/extensions/

Seperate issue : Your system details show that you need to update your Adobe Flash Player (you are running a very, very old version, which could cause problems) so would you please uninstall your current version and install the latest version, which is 28.0.0.137

Uninstaller : https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

https://get.adobe.com/flashplayer/

Note : some 'extras' may be offered in the download.

Firefox was the beginning of the Quantum era of Firefox and the first Quantum version was Firefox 57. It is the "normal" Firefox now.

You could switch to the Firefox 52 ESR version (Extended Support Release) to be able to use your Legacy extensions, but reverting from Beta 58 will create some issues, like minor loss of some types of data. https://www.mozilla.org/en-US/firefox/organizations/all/ Says that it is intended for "system administrators" who roll out and need to maintain computers for organizations, but it works fine for individual users. I use it myself.

The Firefox ESR 52 version will be supported until 08-28-2018 when the ESR channel switches to ESR 60.2 Quantum