Rated 4 out of 5 stars

This extension is great and I love it. However, it isn't working with the newest version of Firefox (29), just so you know. Can't wait for the update.

EDIT: I was just logging in to edit and add some detail tot his review when I saw your reply. I'm on Windows 7. It finally blocked me from a site, so I know the LB is working in the background, but if I drag the timer out it doesn't display any time countdown even though it's white like it should be. So, I guess the issue is with the timer we can reposition, but the fundamentals of the extension itself still seem to work. I had to use it longer in 29 before I could pinpoint what was up.

EDIT 2: It seems to work on-and-off. Very strange.

This review is for a previous version of the add-on (0.6.6). 

Which OS?

Thanks for letting me know about this.

I'm using FF 29 on Windows 7 and LB seems to be working fine. Which OS are you using? Can you be more specific about what aspect of LB is not working?