Hello,

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

1. Click the menu button , choose History, and then "Clear Recent History...".
2. Under "Time range to clear", select "Everything".
3. Now, click the arrow next to Details to toggle the Details list active.
4. From the details list, check Cache and Cookies and uncheck everything else.
5. Now click the "Clear Now" button.

Further information can be found in the Delete browsing, search and download history on Firefox article.

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

Thank you.

Diego Victor said

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. ...

Hi Diego,

Thanks for such a quick reply! Unfortunatelly, that didn't work. I've cleaned all Cookies and Cache, reloaded Firefox, but the problem persists. Anything else I could do?

Hello,

Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes).

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:

• In Firefox 29.0 and above, click the menu button , click Help and select Restart with Add-ons Disabled.
• In previous Firefox versions, click on the Firefox button at the top left of the Firefox window and click on Help (or click on Help in the Menu bar, if you don't have a Firefox button) then click on Restart with Add-ons Disabled.

If Firefox is not running, you can start Firefox in Safe Mode as follows:

• On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac: Hold the option key while starting Firefox.
• On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
  (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)

When the Firefox Safe Mode window appears, select "Start in Safe Mode".

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, theme, or hardware acceleration. Please follow the steps in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

Hi,

I'm afraid safe mode doesn't eliminate the issue...

I've found on other forums that I'm not the only one having this problem with uploading, so lucky you, I've found a solution! I've tried downloading new version of Adobe Flash - didn't help, worked with anti-virus - didn't help either. So I just tried "Reseting Firefox to its default state", because that should fix the unlisted problems, and it did. It's all good now, I can upload files again. :) Thanks for your support, Diego Victor :)

Here's a link on how to Reset your Firefox: https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems

PS. It might have been a problem with my add-ons (but I'm not sure), since I had to do download new ones when the FF upgraded. So you might check those out first before reserting to default state.

There's a bit of irony here in that the "Add images" button on this Post a Reply form doesn't work, either. ;-)