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!

Alright! deal... will do this now, and report back immediately.

regards, Amjo

Thank you!... this solved my problem. Worked like a charm!

If it happens again then you can first try some basic steps like these:

Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.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

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

i unmarked this problem as "Solved" since that error is back again... i currently have no extensions nor themes installed, so basically Cor-el's solution also didn't work (which i thank you for providing the option, by the way.)

would it help if i provided the link to see for yourself?! i hope it does:

• http://www.alquds.com/

anwyay.. hope it helps... i'm resetting everytime since it's just one button. error disappears for a while, then after a long usage, it comes back.

cheerz, amjo

Did you try the other suggestions about the clearing or bypassing cache?

Which security software (firewall, anti-virus) do you have?

Does it has any advanced setting to block (possibly ad related) content?

Dear Cor-el,

yes, i have tried every cache clearing techniques you posted. in fact, i do clear the cache on a regular basis, since im a web-developer myself. comes in handy when debugging.

security software: Windows Defender Version: 4.0.9200.16384 Antimalware Client Version: 4.0.9200.16384 Engine Version: 1.1.9103.0 Antivirus definition: 1.143.681.0 (up-to-date) Antispyware definition: 1.143.681.0

reminding you i run on windows 8.

if it helps, i have removed all the extensions. i don't have any extensions installed since this issue occurred, so that i can eliminate the possibility of extensions causing this problem.

however, it recently occurred to me that the Java SE7 U11 may be the issue behind this whole problem since i really don't see this issue being posted online; and this java security update issue is quite common.

you think that would be a lead?!

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.