Add native support for treestyle vertical tabs extension

[Apostkef]

Now that firefox natively has vertical tabs, please, when i switch to vertical tabs, and have the treestyle vertical tabs extension enabled, give us an option to choose which vertical tab implementation we want to use. Now, we have to minimize the native tabs each time we open a new firefox instance (or when you make an incognito mode instance). Please make it so i have to choose only one time. I wish one day the native solution is as robust as this extension, so i don't need to have 2 solutions for the same thing.

[Jon]

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