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invaded by add pop up whith new version

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Since I upgrade to the new version. Pop up, redirection to other site, adds. Up to the point that firefox is almost not usable. I did not have any of those problems on the older version

Since I upgrade to the new version. Pop up, redirection to other site, adds. Up to the point that firefox is almost not usable. I did not have any of those problems on the older version

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Sorry to hear about that. Your Firefox reported that it is version 43.0, which is not the latest version, so perhaps you installed an older version hoping it would resolve this issue??

Hopefully you didn't install a "patch" or urgent update pushed by an orange page with the Firefox logo. There is some malware going around that uses that distribution method. In that case, start with step 3 on my list below.

Here's my suggested procedure for tracking down and cleaning up bad add-ons, hijackers, and other troublemakers. I know it seems long, but it's not that bad.

(1) Open the Windows Control Panel, Uninstall a Program. After the list loads, click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help in smoking out undisclosed bundle items that snuck in with some software you agreed to install. Take out as much trash as possible here. (If in doubt, feel free to post a screenshot.)

(2) Open Firefox's Add-ons page using either:

  • Ctrl+Shift+a
  • "3-bar" menu button (or Tools menu) > Add-ons
  • in the Windows "Run" dialog, type or paste
    firefox.exe "about:addons"

In the left column, click Plugins. Set nonessential and unrecognized plugins to "Never Activate".

In the left column, click Extensions. Then, if in doubt, disable (or Remove, if possible) unrecognized and unwanted extensions. Bear in mind that all extensions are optional.

Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.

Any improvement?

(3) You can search for remaining issues with the scanning/cleaning tools listed in our support article: Troubleshoot Firefox issues caused by malware. These on-demand scanners are free and take considerable time to run. If they finish quickly and especially if they require payment, you may have a serious infection. I suggest the specialized forums listed in the article in that case.

Hopefully at this point, it is truly gone.