Hey ConeBone, hoping you see this here since your comment is marked as dead.
The .xpi has already fixed the problem permanently (I think). You can just leave it, or if you want you can uninstall it now just as a matter of cleanliness. I'm linking to this comment about how to uninstall because I'm not satisfied with my solution and I'm hoping someone will contribute a better one: https://news.ycombinator.com/item?id=19827428
You can see the addon in about:support, but it doesn't give you a way to uninstall it, just see that it is installed.
The .xpi has already fixed the problem permanently (I think). You can just leave it, or if you want you can uninstall it now just as a matter of cleanliness. I'm linking to this comment about how to uninstall because I'm not satisfied with my solution and I'm hoping someone will contribute a better one: https://news.ycombinator.com/item?id=19827428
You can see the addon in about:support, but it doesn't give you a way to uninstall it, just see that it is installed.