Jau novembrī sākot no Firefox 57. versijas Mozilla nolēmusi pilnībā visu sačakarēt.

Atverot firefox add-on (spraudņu) lapu jau tagad redzam, ka 99% lietoto add-on rādās, kā "Legacy". Ko tas nozīmē?

To mums Mozilla laipni paskaidro:

What's happening?
In the past, add-ons often stopped working each time a new version of Firefox was released, because developers had to update them every six weeks to keep them compatible. Since add-ons could also modify Firefox internal code directly, it was possible for bad actors to include malicious code in an innocent-looking add-on.

To address these issues, and as part of broader efforts to modernize Firefox as a whole, we’ve been transitioning to a new framework for developing Firefox extensions. Outside of rare instances, add-ons created with the new standard, called WebExtensions, won’t break in new Firefox releases. You can still personalize Firefox with add-ons the same way you do now, except they won’t break in new Firefox releases.
Note: Starting in Firefox 57, which will be released in November 2017, only add-ons built with this new technology will work in Firefox. These are indicated by the "Compatible with Firefox 57+" label on addons.mozilla.org (AMO). Add-ons built with the old technology are labeled "Legacy" in the Add-ons Manager (about:addons) tab.

Lai arī ideja varbūt ir cēla un pareiza, esmu pārliecināts, ka tas kas patiesībā notiks ir tas, ka liela daļa add-on (spraudņu) autoru atmetīs tam visam ar roku un pateikts - ejiet dillēs, neko mēs nepārtaisīsim. Līdz ar to 99% manis izmantoto spraudņu, protams, nestrādās.