The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

That only helped with the problem I was having with selecting settings in the Privacy Settings menu - I still cannot clear files from the download manager.

Make sure that you do not run Firefox in (permanent) Private Browsing mode.

• https://support.mozilla.org/kb/Private+Browsing

• Tools > Options > Privacy: Use custom settings for history
• Deselect: [ ] "Always use private browsing mode"

Did you try to do this via the right-click context menu of an entry?

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe mode start window or otherwise make changes.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

I've done everything suggested in this thread and I still have the same issue as Mia.

When I start a download it doesn't even show up in the download manager. If I start a second download however that one will show up, and any more I do after that will also show up.

Then the downloads that are currently in the download manager aren't registering at all. I cannot pause, nor delete them from the download manager.

Also, as Mia said the clear list button doesn't work.

I've done nothing different in my browsing behavior nor have I added any add ons or anything, it just up and stopped working....

Hope this gets resolved soon.

Can you remove a selected item in the download manager with Delete or Shift+Delete?

Try to delete the downloads.sqlite file in the Firefox profile folder

• http://kb.mozillazine.org/Unable_to_save_or_download_files

You can use this button to go to the Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder

Try to create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

• https://support.mozilla.org/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 some files from an existing profile to the new profile, but be careful not to copy corrupted files.

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

I have this problem as well. I've tried: -Deleting downloads.sqlite -Starting in safe mode -Resetting Firefox -Creating a new profile

The first time I opened Firefox after resetting, the problem was resolved, but it immediately returned. When I created a new profile, it didn't work at all. I did not re-install any add-ons; the only thing I copied was my bookmarks. Running OS X 10.8.2.

I seem to be able to remove items from the Downloads window by right-clicking and selecting "Remove from list." The problem is with the "Clear List" button, which is greyed out.

same problem here since FF 19.... i dont know what they fix, but i know what they broke: the clear list button

We are aware of this issue and it should be fixed in FF 20. Can you give 20 a shot and let us know if that fixes it?