Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Rohkem teavet
Solved Archived

Ever since I upgraded to FF 16.0.2 Gmail will not allow me to click on any message. I get this error "Oops… the system encountered a problem (#405)-Retrying"

jarut1978

Google Chat still works on the page, but I cannot access any message and the window does not refresh to show new messages. I am on Windows XP SP3 and have not seen any issues until the upgrade to FF 16.0.2 last week. I also have not installed any new software nor have I made any changes to my internet security software. I can access Gmail through IE8 and on my phone so it is not a Gmail issue.

Google Chat still works on the page, but I cannot access any message and the window does not refresh to show new messages. I am on Windows XP SP3 and have not seen any issues until the upgrade to FF 16.0.2 last week. I also have not installed any new software nor have I made any changes to my internet security software. I can access Gmail through IE8 and on my phone so it is not a Gmail issue.

All Replies (2)

Valitud lahendus

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!

If it happens again then try these steps:

Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

  • Press and hold Shift and left-click the Reload button.
  • Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
  • Press "Command + Shift + R" (MAC)

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

  • Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

  • Tools > Options > Privacy > Cookies: "Show Cookies"

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.