BrowserStack recommends switching to Chrome … So they’ve given up on porting their old Firefox add-on to the new WebExtensions API? @browserstack Could you update the message with more accurate information?

sounds pretty lame :/ why not update extension?

I’m sure they’ll do it eventually. This is probably a matter of priorities, and their message is just bad wording.

In their defense, if you break stuff with no transition period it's a valid statement. It would be like us removing ActiveX with no IE11 in box. So technically what they're saying is true.

Also, the add-on issue is one of the most common negative statements I'm seeing from customers regarding 57. A transition period probably would have been good.

Addons knew this was coming for more than a year. Previous releases also supported the new API. There was a long transition period already.

blog.mozilla.org/addons/2015… was nearly 27 months ago, though didn't yet have an exact timeline.

It's not about length of time, it's how much effort goes into building a bridge and helping people cross it.