Please update to the latest version (1.0.1) of this add-on from the previous version (0.0.8). You may receive updates automatically if you kept this add-on installed.

I tested it on latest Firefox. It works again as before. If this solves the problem, please consider rating 5 stars. If the issue continues, please inform me again.

Thanks for using this add-on.

Best Regards,
Arafat Husayn.