Great! Rated 5 out of 5 stars

That's really wonderful! I heard so much about Wolfram Alpha which is huge rival but I don't compare it with Google. Now with this add-on I did! Thanks so much! I think we should add this add-on on default browser! :D

This review is for a previous version of the add-on (0.8). 

Thanks

Great to hear that you liked the add-on. There is no greater praise for an add-on developer than people wanting it in the default browser ;-)