Excellent add-on! It deserves 5 stars.

I believe this add-on should be a default one in Firefox. And I also believe this add-on is better than similar adds-on because:

1) It is absolutely minimalist (in all the sense of the word). It is the lightest add-on in its category, with almost zero system impact (RAM, CPU, browsing speed etc). And it doesn’t invade privacy, totally discrete.

2) It appears only when active, and only inside the UrlBar, saving space in the NavBar, and avoiding visual pollution.

3) The number of HTTP webpages is less and less everyday. So, without disrespecting other add-ons, there is no need anymore for heavy or complex add-ons dealing with HTTP webpages, interfering with browser speed, system impact, privacy etc. Instead, this powerful minimalist add-on working together with an extra few “about:config” rules... it perfectly can deal with HTTP webpages.

4) Some users may want more automation for this add-on, or whitelists etc. I really hope this add-on will stay minimalist, because 90% of the HTTP are not working with HTTPS, so there is no sense for automation or whitelists. It is simple, if a HTTP webpage appears, then press the icon of this add-on, and if it is not working with HTTPS, then just press the back-button. Let's keep it simple!

Congratulations and thank you to the Developer MrOtherGuy!