I cleared the cache in the clear history section, is that the same thing?
Still an issue after that though.
You want to clear the "cached images & content" - on Firefox it's under the Privacy & Security. You'll find a Cookies and Site Data section with a "Clear Data" button. No need to clear cookies, but you do want to make sure Cached Web Content is checked...
...regardless - I think I have it cleaned up now. Let me know if it's still fucking up.