First, nice work. I lately switched from grammerly over to here, and like the way it feels and what it corrects.
But today I observed an interesting and very annoying behavior over at the BaseCamp website.
I wrote some line, and wanted to append a URL (copied from the Browser location bar) at the end of the last line I just wrote. But what the replacement did was just replace the whole line and f***ed up the undo history, since undoing that pasting step just ignored what just happened and undid things I changed in the last before. There was no way to retrieve the last line that got replaced.
For fun, I just rewrote the line, and tried to paste again at the end of the line, and the same thing happened again. So it is kind of reproducible. The third time, I just prepended my line before the URL, to not have to write that again
Would be nice if someone can check it up.
And if this forum is not the right place to put a bug report, you could point me to the right location.
Some environment notes:
I use the plugin within Firefox 67.0 on an Ubuntu derivate and wrote in English.