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Why does is the Content tab in Preferences missing?
When I try to view the Content tab in Preferences, it shows the last tab I clicked on. For example, when I click on Tabs and then try to view the Content tab, it shows the Tabs tab.
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Start Firefox in Troubleshoot Firefox issues using Safe Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).