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Dropdowns, menu bar, and close button stop working in v53.0.3

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I'm running Windows 7 64-bit, and after having Firefox open a short time, the menu bar, minimize/close buttons, and all dropdown menus stop working (I can still click on a dropdown and scroll through the entries with the arrow keys). I have to force quit Firefox via the Task Manager each time. I have tried running Firefox in Safe Mode and the same thing happens. I also did Firefox Refresh and it didn't solve the problem. Initially I had accidentally downloaded the 32-bit version of Firefox, and that's when the problem started. After uninstalling that and installing the 64-bit version, the problem persisted.

I'm running Windows 7 64-bit, and after having Firefox open a short time, the menu bar, minimize/close buttons, and all dropdown menus stop working (I can still click on a dropdown and scroll through the entries with the arrow keys). I have to force quit Firefox via the Task Manager each time. I have tried running Firefox in Safe Mode and the same thing happens. I also did Firefox Refresh and it didn't solve the problem. Initially I had accidentally downloaded the 32-bit version of Firefox, and that's when the problem started. After uninstalling that and installing the 64-bit version, the problem persisted.
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Additional System Details

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  • User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:53.0) Gecko/20100101 Firefox/53.0

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cor-el
  • Top 10 Contributor
  • Moderator
15577 solutions 141049 answers

Create a new profile to test if your current profile is causing the problem.

See "Creating a profile":

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.


Do a clean reinstall of the current Firefox release and delete the Firefox program folder before installing a fresh copy of the current Firefox release.

If possible uninstall your current Firefox version to cleanup the Windows Registry and settings in security software.

  • do NOT remove "personal data" when you uninstall the current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

  • (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
  • (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you uninstall and reinstall or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.


Create a new profile to test if your current profile is causing the problem. See "Creating a profile": *https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles *http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems. *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox ---- Do a clean reinstall of the current Firefox release and delete the Firefox program folder before installing a fresh copy of the current Firefox release. *download the Firefox installer and save the file to the desktop<br>*https://www.mozilla.org/en-US/firefox/all/ If possible uninstall your current Firefox version to cleanup the Windows Registry and settings in security software. *do NOT remove "personal data" when you uninstall the current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer. *(32 bit Windows) "C:\Program Files\Mozilla Firefox\" *(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\" *it is important to delete the Firefox program folder to remove all the files and make sure there are no problems with files that were leftover after uninstalling *http://kb.mozillazine.org/Uninstalling_Firefox Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you uninstall and reinstall or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data. <hr> *http://kb.mozillazine.org/Profile_folder_-_Firefox *http://kb.mozillazine.org/Profile_backup *http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall
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Question owner

I tried all of the above and it's still happening.

I tried all of the above and it's still happening.
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UPDATE: A couple other things I notice aren't working are right-clicking (no menu pops up) and using the arrow/page keys to scroll. Everything works fine when I open a fresh instance of Firefox, but after browsing for a short time, these things as well as the things in my original post stop working. I tried each of the options posted by cor-el above and none of them solved the problem.

UPDATE: A couple other things I notice aren't working are right-clicking (no menu pops up) and using the arrow/page keys to scroll. Everything works fine when I open a fresh instance of Firefox, but after browsing for a short time, these things as well as the things in my original post stop working. I tried each of the options posted by cor-el above and none of them solved the problem.
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cor-el
  • Top 10 Contributor
  • Moderator
15577 solutions 141049 answers

Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.

Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems. *http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/ *http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10
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