The plugin-container.exe has basically rendered my browser worthless and seems to be a growing problem. I've tried completely uninstalling Firefox and reinstalling it, updating Flash and all other associated Adobe products, but nothing helps. The plugin crashes Youtube (always) and pretty much every other video I try to watch. When I shut it down in task manager, it crashes the page, and when I reload the page it starts to run again. This has become a seriously annoying problem, and if I can't fix it I'm going to have to give up on Firefox as a browser. I'm not sure what you've tweaked over the past year or so to destroy a perfectly good browser, but whatever you did it was a huge mistake. Many of my friends who recommended Firefox to me have already abandoned it due to this problem and I'm ready to myself. It's just to buggy and it wastes too much time to struggle with it to watch a video.