Crashes Twitter if Twitter language is set to JPN and automatic injection is on.

Nice extension, but I face an issue.

I used this extension on Youtube. It worked fine once, but it is not working since then.

Also, the browser cannot make any request. So, no new comments load and no webpage can be opened after using the extension.
The problem resolves if I restart Firefox.

Please fix this. This is a really nice extension for firefox.