Why can't I edit my question and why text formatting is broken?

try to clear cache from options->advanced->network, if needed, you may also want to clear cookies.

crislevin said

try to clear cache from options->advanced->network, if needed, you may also want to clear cookies.

No change, I also restarted my browser.

One possibility:

Is the forum a secure (HTTPS) site? If you have blocked mixed "display" content on secure sites, then images on HTTP URLs will not be retrieved. But since you generally need to use about:config to make this change, it might not apply to you.

Was anything in this article applicable: Fix problems that cause images to not show?

Solved. Privacy Badger was causing this, I had blocked Imgur.

That was very good work. Well Done. Please flag your last post as Solved Problem so other will know.