hello, first of all please try to Update Firefox to the latest release (firefox 18.0.1) - you're using a very old and insecure version at the moment.

if this didn't fix the issue already, then maybe the files in your profile folder that store the information about your extensions might have become corrupted. please go to firefox > help > troubleshooting information > profile - show folder... then windows explorer should open up your profile folder. in there look for the files named extensions.ini, extensions.sqlite, extensions.sqlite-journal (and in some cases also extensions.txt, extensions.rdf). delete or rename those files and quit firefox, they will be regenerated the next time you launch firefox.

also see https://support.mozilla.org/en-US/kb/Unable%20to%20install%20add-ons#w_co...

''''thank u soooooo much...madperson'''', it worked for me. see i`ve another problem with adobe flash player: it is not working and i can`t open the web page to install it.....i think it is blocked by bitdefender...tried to change the host files but failed....also tried to change the firewall rules but didn`t know how...i`ve been trying for ages to fix this flash player problem...may u help me please!!!!

hello, the official download-link for flash is https://get.adobe.com/flashplayer/

what exactly is happening when you're trying to access it? you might try a full scan of your system with different other security tools like the free version of malwarebytes, microsoft safety scanner & kaspersky security scan...

i get this message server not found firefox can`t find the server at get.adobe.com....also with IE

i`ve tried disabling the antivirus and the firewall but it didn`t worrk

I have been getting the installer for the Adobe Flash plugin here:

• http://www.adobe.com/products/flashplayer/distribution3.html

From the table, you just choose the version you need for your operating system.