Hi, I've been using Firefox for years, and suddenly I'm having these strange issues which are forcing me to use another browser while doing schoolwork. They are as follows: - Discord. When I have Discord open, and then I click another tab, when I go back to Discord the whole screen is black. When I refresh it it's fine, but I have to do this repeatedly each time I go to another tab. - PDFs. I use Blackboard for my college assignments, and Firefox no longer allows me to open PDFs that teachers post- I just get a blank page when I click on one. - Black images. Most images show fine, but with some websites (for eg. home depot) the image of the product is black. I've cleared history, cache, cookies, disabled extensions, and still no dice. Not sure what happened/how to solve this :( Thanks for any help! zoe