That said, you can probably use an extension like CJS to just run that JS on the VTT pages without the bookmarklet. Just take javascript: off the front and put it in for the page. CJS: <a href="https://addons.mozilla.org/en-US/firefox/addon/jsi" rel="nofollow">https://addons.mozilla.org/en-US/firefox/addon/jsi</a>... I've not tried this, mainly because I'm a little bit lazy. =D