If you're on a website that uses accounts, the sign in button can be anywhere. Sure, there are some common best practices, but I can think of dozens of sites that put them all over the place. Mozilla is looking to fix that, by bringing the sign in to the browser level.

A new experimental extension that Mozilla has released for Firefox does exactly this. When it's installed, you'll see a new "Sign In" button just to the left of the URL box. Clicking this, pops open a window that prompts you for [...]

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