DanskHjemmebioForum.dk

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In the Firefox address bar, type "about:config" and press "enter".
A caution box stating "This might void your warranty..." will pop up.
Select the "I'll be careful. I promise." box by left-clicking your mouse.
In the search box, type "extensions.blocklist.enabled" and press "enter".
If the line is present, it should have the boolean value "true".
If the value is "true", toggle the value to "false" by double-clicking the line.