Thanks for this addon. I'm looking for it as a substitute of Clipboard Plus in quantum because it seems to me the developer is very active here.
I've two requests, hoping you could add that. First, I think a keyboard shortcut (maybe customizable) is necessary for a comfortable use of the functionality. Clipboard Plus used ALT+A, but maybe there could be other comfortable options (maybe ALT+C, easier to remember?). Second thing, I think that the better way to separate the copied elements would be a custom string, including special characters such as \n, \t, etc... For esemple I often need to use "; " as separator, other times I need tab, sometimes I need double new line. Custom separator (and obviously a way to easily change it) would save me a lot of time.
I'm giving four stars, but I'll edit in five if the addon will be improved.
Thanks!

I still use FireFox 56, to keep all my old addons.
Append-To-Clipboard only seems to work in version 1.1 with FF56
Version 2.0. of a2cb doesn't seem to append anything in FF56.

So 1.1 would be okay 4 me, but here the context-menu isn't cascaded, which I find nicer.
Anyhow good extension. I was looking for that one for a while.

As a suggestion, I think it would be fine if the user could configure his own separator,
Sometimes for example you want to create lines for a CSV file, then you need , or ;
Then again tabs would come in nice. Or whatever. There's a lots of usecases for appending text...

Even cooler if you could do the different types of appending using hotkeys such as Shift+A for append without sep, Shift+Ctrl+A for append with linebreak .. etc...