Rated 5 out of 5 stars

per megaman el jun. 13, 2012 ·

This add-ons does not work, it cannot find the installer or something.
Hopefully, you can fix it, thank you.

Edit: Clicking it several times finally got me to a prompt to add it to my search bar, but many times it would give me an error.

per SSL Search Bar (desenvolupador) a jul. 9, 2012 ·

The addon is fully reviewed and OpenSearch compliant (there's actually no "installer", it's an xml file handled directly by the browser).

Unfortunately, sometimes the AMO site can be a little buggy (I believe I have traced it to a .js file here that users sometimes have problems with) and cause transient issues such as you have described. I am glad that you did manage to get things to work, though.