Dictionaries do not properly install and spell checking not working
before posting the question here I have been searching knowledge databases for an appropriate answer. Without success. I am running FF56 (i know it's old) and I had an issue with one of the installed addons so i had to identified the faulty addon (classic opera) and I ended up reinstalling FF and importing the previous profile. But i missed for some reason the spell check ability. I wanted to (re-)install support for additional doctionaries (not the languages packs ). The installed dictionaries appear indeed in the list of installed addons/extensions but no on a separate entry addons/dictionaries. An entry addons/languages exists and list the installed language packs.
In the options the option "check your spelling as you type" is checked. Under about:config the spell check parameters seem to be correct.
However, the context menu on a text box never shows an entry for spell checking or to choose a dictionary. For the moment I am clueless... Any idea would be welcome! Thanks