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When downloading it gets to the point of checking addons and gets stuck and wont open.

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How do I get past checking addons when I cant open Firefox after downloading Firefox35.0? It seems to download fine but then it gets to the point of checking Addon compatibility and stops.

How do I get past checking addons when I cant open Firefox after downloading Firefox35.0? It seems to download fine but then it gets to the point of checking Addon compatibility and stops.

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You can check if you can start Firefox in Safe Mode by holding down the Shift/Options key.

Create a new profile as a test to check if your current profile is causing the problem.

See "Creating a profile":

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.