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new tabs don't open

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When I start up FF I can add new tabs and new sites,searches will open in them.When I exit(not quit) FF and reactivate no new sites will open in new tab.It opens in the first tab and new tab will stay blank.If I quit FF and restart ,new sites will open in new tabs.Any sggestions?Thanks

When I start up FF I can add new tabs and new sites,searches will open in them.When I exit(not quit) FF and reactivate no new sites will open in new tab.It opens in the first tab and new tab will stay blank.If I quit FF and restart ,new sites will open in new tabs.Any sggestions?Thanks

Chosen solution

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

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Seçilmiş Həll

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

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Thanks.It was a single extension causing the problem.DivX Plus Webplayer 2.1.2.145