Folks, RELAX!!! It's not the developer's fault!!!
Firefox 57 is brand new, and it's likely that the disappearance of the clipboard feature on this add-on is the result of the not-yet-complete WebExtensions API. Other add-ons, take DownThemAll for example, are delayed or missing features because the API doesn't offer all of the functions that the old XUL API had. Mozilla has said that they're working on this stuff!
There's an important rule with free software: If it breaks, you get to keep both pieces!
Patience! :-)
Review: This is a brilliant plug-in. I only discovered it around 6 months ago, and not a day has passed without me using it since. It's everything a good plug-in should be: small, efficient, well designed and completely functional with no unnecessary junk. I'm very pleased that the developer has ported it to WebExtensions! Thank-you!
OK, now, a reward for folks who read this far! There are Lightshot apps for both Windows and Macintosh. It looks identical to the Firefox plugin, it works on the whole desktop not just the browsers, AND IT HAS THE CLIPBOARD FUNCTION!
