Until postimages.org dies. The only way to be safe from shutdowns is self-hosting.
Creator of LULs (a script which helps links to point to your instance)
Come say hi here or over at https://twitch.tv/AzzuriteTV :) I like getting to know more people :)
Play games with me: https://steamcommunity.com/id/azzu
The last time I remember stuff like this happened, it was because of addon conflicts, fresh Firefox with only ublock origin “fixed it” for many people, indicating some other addon was the problem.