I ported the extension from Chrome to Firefox, the code is mostly the same. The needed changes were minimal and you can view the addon's code using Extension Source viewer.
HOW TO USE:
1. Go to any YouTube video that contains captions/subtitles (CC button available).
2. If the extension icon is grayed out, click on the CC button.
3. Click the extension icon to begin searching!
*** REFRESH ALREADY OPEN YOUTUBE PAGES UPON INSTALLATION IF EXTENSION IS NOT ACTIVATING ***
If you found this extension useful, please consider a small donation to the original author :).
https://www.paypal.com/paypalme/brennanho
