After installing the add-on compatability add-on, Firefox will no longer load web pages or allow me to enter anything in the address bar and has added an additional title bar at the top of the page.

When I open Firefox now, instead of opening up the standard Mozilla start page, it simply opens up a new tab page. Typing in the address bar and then hitting enter results in the address bar being cleared and the page staying the same. Attempting to send feedback via the add-on just opens another new, blank tab. For some odd reason, the Windows title bar has also come back above the orange Firefox button and the tabs.
I am unable to access the add-ons page to uninstall the add-on compatibility add-on to see if that will solve my problem and I have tried uninstalling the beta and reinstalling it, but the problem still remains.

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]
* [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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