downloaded a video on facebook and now all new tabs/ other websites turn to facebook mobile

Troubleshooting extensions and themes

• https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes

Restore the default home page

• https://support.mozilla.com/en-US/kb/How%20to%20set%20the%20home%20page#w_restore-the-default-home-page

Location bar search

• https://support.mozilla.com/en-US/kb/Location%20bar%20search

Search bar

• https://support.mozilla.com/en-US/kb/Search%20bar

Do a MALWARE check with these Malware Scanning programs. You need to scan with all programs because each program detects different malware. Make sure that you UPDATE each program to get the latest version of their databases before doing a scan.

• Malwarebytes' Anti-Malware - http://www.malwarebytes.org/mbam.php
• SuperAntispyware - http://www.superantispyware.com/
• Windows Defender Home Page - http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
• Spybot Search & Destroy - http://www.safer-networking.org/en/index.html
• Ad-Aware Free - http://www.lavasoft.com/products/ad_aware_free.php

There are also specialized forums for Malware Removal such as those listed below, where you might be able to get more help:

• Bleeping Computer Forums - http://www.bleepingcomputer.com/forums/
• Spyware Warrior Forums - http://www.spywarewarrior.com/index.php
• SWI Forums - http://www.spywareinfoforum.com/

Check and tell if its working.

@mha007:
The OP is on Linux, so solutions that apply to the Windows platform won't help.

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

"Clear the Cache":

• Edit > Preferences > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

• Edit > Preferences > Privacy > Cookies: "Show Cookies"

it got worse, what shall i do

thanx cor-el its really hard to stay in the same web, thats why i was so short

)

It is possible that servers get confused by your Ubuntu branded user agent with "Ubuntu/9.10 (karmic)".

• Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.2.17) Gecko/20110422 Ubuntu/9.10 (karmic) Firefox/3.6.17

You can try this user agent instead to see if that helps.

• Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.2.17) Gecko/20110422 Firefox/3.6.17

You can set that user agent via the pref general.useragent.override on the about:config page.
You need to update that pref after each update of Firefox or install the version from the Mozilla site instead to avoid that modification of the user agent.

• Firefox 5.0.x: http://www.mozilla.com/en-US/firefox/all.html
• Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html

See also:

• https://support.mozilla.com/kb/Websites+or+add-ons+incorrectly+report+incompatible+browser