Since d-u 4 days ago, Firefox underlines all words in a text box as incorrect. I noticed in Add-ons > Languages all language packs were labelled "Language pack could not be verified for use in Firefox. Proceed with caution". A little search found that language packs now need to be signed by Mozilla, so I updated my current English (GB) to the latest and subsequently the warning did not appear. Also added English (US) just to support their funny spelling.Not solved, all words are still underlined. Does anyone else see this or have a solution?
EDIT: I realised after posting this Language pack !=Dictionary. So installed a different dictionary (British English Dictionary (Marco Pinto)) but problem remains.