Until quite recently, multiple spell-checker languages were available in Firefox on my CentOS 7 system. (They could be selected from "Languages" under the right-click menu in text boxes.) After a recent system upgrade, there is only "English (United States)".
I don't think I had installed any extra Firefox dictionaries as such, but the "global" spell-checking support is set up to support a few extra languages via hunspell-<lang> software packages. I believe Firefox used to be able to pick these up - probably through a link from /usr/lib64/firefox to /usr/share/myspell that the CentOS firefox package provides.
Did I get that right? Has the mechanism stopped working? Is there any way to re-enable the system dictionaries?
Note that I get all the expected dictionaries in Thunderbird, which appears to rely on a similar hack.
My Firefox is "firefox-68.1.0-2.el7.centos.x86_64".
Thanks.
- Toralf