Rated 4 out of 5 stars

per Mike Young el gen. 23, 2017 ·

FireFTP (I have 2.0.29) is still working but getting an error message on drag and drop which is fixed in a later release. Unfortunately the latest release is marked as incompatible with Firefox 50. Hope this gets resolved soon, FireFTP is a really good FTP extension.
Firefox 50.0.1 was saying it was up to date (in About Firefox). Went to FF website and got the latest (51) and all is now ok.

per Mime Čuvalo (desenvolupador) a gen. 26, 2017 ·

Please upgrade to 2.0.31 and Firefox 51 and that'll fix the issue.