Hi Frank, some extensions stopped working in Firefox 57 due to changes to extension programming requirements. Those legacy extensions sometimes have replacements by the same author under the same name, and in other cases need to be replaced with something else that has similar features. Back in the day there was a spreadsheet to help people find replacements, but I've lost track of where that was... As a starting point, can you find those extensions on the Add-ons site now? https://addons.mozilla.org/firefox/extensions/