Firefox 61.0.1 (64-bit) with Kubuntu 16.04 : The dropdown menu and history buttons don't work and I can't install extensions, yet javascript is enabled.
After the last update, pressing the top-right buttons of the browser won't do anything, i.e. the drop down menu won't show nor the history information. I refreshed firefox trying to fix the problem but it persisted. Not only that but as my extensions were uninstalled I tried to install them back only to find that when I press the button: add to firefox nothing happens.
So I found that this might be a problem of javascript, and I went to check whether it is unabled or not. And everything in the about:config page seems to be as it should.
My theory is that the menus don't display properly, yet they somehow activate as I'm able to launch a new tab and a new private window by clicking in the menu button and moving with the arrow keys. (although I see nothing displayed on the screen). Yet I have no idea on how to solve this problem.
All Replies (2)
Certain Firefox problems can be solved by performing a Clean reinstall. This means you remove your Firefox program files and then reinstall Firefox. This process does not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location.
To do a clean reinstall of Firefox, please follow these steps: Note: You might want to print these steps or view them in another browser.
- Download the latest Desktop version of Firefox from mozilla.org (or choose the download for your operating system and language from this page) and save the setup file to your computer.
- After the download finishes, close all Firefox windows (or open the Firefox menu
and click the close button 
).
- Delete the Firefox installation folder, which is located in one of these locations, by default:
- Windows:
- C:\Program Files\Mozilla Firefox
- C:\Program Files (x86)\Mozilla Firefox
- Mac: Delete Firefox from the Applications folder.
- Linux: If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see Install Firefox on Linux. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
- Windows:
- Now, go ahead and reinstall Firefox:
- Double-click the downloaded installation file and go through the steps of the installation wizard.
- Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found here.
WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your Firefox profile data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See Back up and restore information in Firefox profiles.
Please report back to say if this helped you!
Thank you.
You can check for Xrender related issues and try to toggle gfx.xrender.enabled on the about:config page.