Firefox 57 freezes when opening menu or checking on downloads
I'm using Firefox 57 on Windows 10 Pro 64 bit. Whenever I try to use anything in the toolbar, Library, add-ons, check on download progress, or even just opening the menu, Firefox freezes and I have to force it to close. I've reinstalled Firefox 3 times now, same thing. I've cleaned out Program Files, Program Files(x86), AppData/Local, AppData/LocalLow, and AppData/Roaming before each reinstall. Pretty much tried everything but scrubbing the registry. It happens whether in the standard browser, a private window, or safe mode.
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Sounds like you are doing everything we would suggest. Are you installing from a Full Version Install or the Stub ? https://www.mozilla.org/firefox/all/ Full Version.
Repair System Registry and Files
(FOR DOING Above & Below - WINDOWS All OTHER VERSIONS - Use Search To Find Command Prompt ** Enter CMD.exe to Find COMMAND PROMPT Then Right Click & RUN AS ADMIN)
To run the SFC command use the Windows key + X keyboard shortcut to open the Power User menu and select Command Prompt (Admin). Type "SFC /SCANNOW" (without quotes or copy/paste) and press Enter. For more information on using SFC, please refer to the Microsoft KB: Use the System File Checker tool to repair missing or corrupted system files
Run the Windows Deployment Image Servicing and Management (DISM) and System File Checker (SFC) tools as Administrator. The DISM and SFC tools scan the integrity of the Windows image and all protected system files replaces corrupted, damaged and incorrect versions. (FOR DOING Above & Below - WINDOWS All OTHER VERSIONS - Use Search To Find Command Prompt ** Enter CMD.exe to Find COMMAND PROMPT Then Right Click & RUN AS ADMIN) Type "DISM /Online /Cleanup-Image /RestoreHealth" (without quotes or copy/paste) and press Enter.
Windows 10 To run the DISM command use the Windows key + X keyboard shortcut to open the Power User menu, then select Command Prompt (Admin). Type "DISM /Online /Cleanup-Image /RestoreHealth" (without quotes or copy/paste) and press Enter. While running DISM you may notice the process will appear to pause at 20%. After a few minutes the operation will continue.
Note : SFC fixes files locally using files found on your system. Note : DISM goes up to Microsoft for new ones.
Please let us know if this solved your issue or if need further assistance.
Shortly after posting this, I had the idea to run Firefox as an Administrator. You know, right click the executable or shortcut and choose 'Run as administrator'. If fixed all the issues I was having. I then uninstalled and ran the install as an administrator the same way. That unfortunately didn't work. I still have to open Firefox as an administrator with each use.
Neither the SFC nor the DISM fixed anything for me. I ran the Windows Disk Cleanup utility as well to clean out some junk files. That made no change either. The Run as administrator workaround is the only thing so far that I've found that alleviates any of the issues.