I honestly don't remember when I updated Firefox. Both of them work off of 47.0. I can try for a reinstall.
Extension-wise, the only ones on my desktop that aren't on my laptop are Cookies Manager+ (last updated a few days before I had issues), MEGA (last updated today), a few HP-related ones (laptop's a Dell, desktop's HP, these were all updated about three years ago.), and Tumblr Savior (last updated in April.) Plugin-wise, they're largely identical, with the exception of some HP stuff and Uplay PC.
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Extension-wise, the only ones on my desktop that aren't on my laptop are Cookies Manager+ (last updated a few days before I had issues), MEGA (last updated today), a few HP-related ones (laptop's a Dell, desktop's HP, these were all updated about three years ago.), and Tumblr Savior (last updated in April.) Plugin-wise, they're largely identical, with the exception of some HP stuff and Uplay PC.