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How to change the new tab page?

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Hi , I want to change the page when i'm opening a new tab. when I'm opening a new tab i see this page : http://i.imgur.com/J2LfDh7.jpg I've tried to change browser.newtab.url to about:blank and it didn't work I even tried to change browser.newtabpage.enabled to false , but no results. any help? ty. and other thing , I have lastpass extension for firefox , and when i'm trying to acess the vault it sending me back to the quick start page. how do i solve it?

Ændret af sabag123 den

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

  • Do NOT click the Reset button on the Safe Mode start window.

Note that your System Details List shows that you have a user.js file in the profile folder to initialize some prefs each time you start Firefox.

The user.js file is only present if you or other software has created it, so normally it wouldn't be there. You can check its content with a plain text editor if you didn't create this file yourself.

The user.js file is read each time you start Firefox and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.