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

"Clear the Cache":

• Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

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

Also make sure that your security software (firewall) isn't modifying the HTPP response header.

Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.

See:

• https://support.mozilla.org/kb/Server+not+found
• https://support.mozilla.org/kb/Firewalls

Thanks cor-el but it still doesn't work.

I cleared the Cache and tried to "Remove Cookies" but couldn't find anything to do with Cookies under Privacy. I also can't find anything to do with Mozilla/Firefox in AVG or Windows Firewall which might be causing a problem.

The problem's on popular sites like Runescape (Billing) and Torrent sites.

Hi Odinson, May I know the operating system you are using.

Your screenshot shows binary data and is not the result of a wrong encoding.

Do you see that web page correctly if you use a site like Google Translate with a random source language to view the page?

• http://translate.google.com/?hl=en&ie=UTF-8&sl=fr&tl=en

Windows 7

I wasn't sure what it was, probably why none of the wrong encoding tutorials I follow ever help. Yes, the text shows but in basic HTML.

Hi Guys, I use Firefox 13.0, Windows 7 Professional. When i open gmail they open up in weird charaacters only. Please see the attached screen cast.

Edit: I have now updated to Firefox 13.0.1 but the issue persists...

I'm still having this issue too! Websites like Twitter are appearing like this now too.

You can check the network.http.* prefs on the about:config page and reset all bold user set network.http prefs to the default value via the right-click context menu -> Reset.

• http://kb.mozillazine.org/about:config

Check at least:

• network.http.accept-encoding: gzip,deflate

Yes that solves it. But my website[my project] gives me an encoding error[because of which i had done those change]. Can you tell me why such error occurs so that i can fix it in my site?

Thanks! You've just solved a problem I've had for months.

quote:

But my website[my project] gives me an encoding error[because of which i had done those change]. Can you tell me why such error occurs so that i can fix it in my site?

Sounds that the server isn't configured properly and isn't sending the files with the correct compression.

• http://httpd.apache.org/docs/current/mod/mod_deflate.html