Takes a little more to setup than most add-ons, but if you type a lot of text or code into website text fields give it a go.

I used this to help fill out an EU consultation and it worked a treat. Those forms have dozens of pages with teeny text fields, and integrating Atom not only was more manageable, but had my dark theme and installed packages too!

I have been using ItsAllText on Linux with the Emacs editor for a long time. When this extension became unsupported, I started searching for a replacement. I am happy with GhostText, which works well enough. Note that Emacs requires atomic-chrome in order to work with GhostText. Thank you!

I didn't give 5 stars because sometimes GT gets a bit confused and the editor unsyncs from GhostText. But it might be a problem with the editor extension.