Metamask recently released Metamask Flask for Google Chrome. I just found this in the Firefox Store. Metamask makes no mention of a Firefox build and there are no commits on Github to indicate that one has been released. I'm pretty sure this is a fake extension. Paging u/rdymac and u/hober-mallow-1337 as this is potentially serious and people could get absolutely rekt. If I'm wrong I'll delete this.
Edit: Everyone just flag the extension in the store please. I don’t wanna people lose all their money.