Want to use, but can't find the button Rated 1 out of 5 stars

Add On bar is removed in new versions of Firefox. Where is the button to activate this plugin?

Where can we find it ? Rated 2 out of 5 stars

I used this extension a While ago, but now I can't find the button anymore. Firefox's tollbars have change ... Any update ?

This user has a previous review of this add-on.

Should not lock the icon in the addon bar... Rated 4 out of 5 stars

I'm giving this a 4 star rating merely for the fact the the icon/button is locked in the addon bar. This leaves users that want to keep the addon bar hidden with no alternative.

I'm willing to change my rating to 5 stars if the maintainer would make it so that the icon can be placed in any toolbar ;)

Really cool. But should support longdesc attribute too. Rated 4 out of 5 stars

Semantic Checker is really cool. (Although, like Xavier, I did not see the addon until I read your comment to him about the addon bar.)

But one thing:Could you add @longdesc to the list of semantic features that this checker supports?

For the record, the HTML5 validator now accepts @longdesc on the img element. And there is even a spec for it - see
https://dvcs.w3.org/hg/html-proposals/raw-file/default/longdesc1/longdesc.html