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Firefox Drop Down Freeze

  • 2 cavab
  • 1 has this problem
  • 5 views
  • Last reply by Mel

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I have a user on Windows 10. She goes to a home grown company website made with PHP, Javascript and MySQL. The drop downs completely freeze on Firefox. There are no errors when you go to developer tools.

I used the Refresh Firefox to fix this error once before about a month+ ago. The user refuses to allow me do this option again saying she lost all of her passwords in Password Manager.

Why does this keep occurring? How can I fix this issue without using Refresh Firefox?

I have a user on Windows 10. She goes to a home grown company website made with PHP, Javascript and MySQL. The drop downs completely freeze on Firefox. There are no errors when you go to developer tools. I used the Refresh Firefox to fix this error once before about a month+ ago. The user refuses to allow me do this option again saying she lost all of her passwords in Password Manager. Why does this keep occurring? How can I fix this issue without using Refresh Firefox?

All Replies (2)

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Hi Mel, could you have the user do the following, which will not affect bookmarks or passwords:

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Clear Firefox's Cache

See: How to clear the Firefox cache

If you have a large hard drive, this might take a few minutes. If you do not see the number going down on the page, you can reload it using Ctrl+r to check progress.

(2) Remove the site's cookies (save any pending work first). While viewing a page on the site, try either:

  • right-click (on Mac Ctrl+click) a blank area of the page and choose View Page Info > Security > "View Cookies"
  • (menu bar) Tools > Page Info > Security > "View Cookies"
  • click the padlock or "i" icon in the address bar, then the ">" button, then More Information, and finally the "View Cookies" button

In the dialog that opens, the current site should be pre-filled in the search box at the top of the dialog so you can remove that site's cookies individually.

Then try reloading the page. Does that help?


If that has no effect, could she test in Firefox's Safe Mode? In Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem.

If Firefox is not running: Hold down the Shift key when starting Firefox.

If Firefox is running: You can restart Firefox in Safe Mode using either:

  • "3-bar" menu button > "?" button > Restart with Add-ons Disabled
  • Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any improvement?

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Thanks for the response. I will try the suggestions.