prevent "Error: The sidebar is already hidden" (A promise chain failed to handle a rejection. Did you forget to '.catch', or did you forget to 'return'?)
prevent "Error: The sidebar is already hidden"
(A promise chain failed to handle a rejection. Did you forget to '.catch', or did you forget to 'return'?)

languagetool-org/languagetool-browser-addon,languagetool-org/languagetool-browser-addon,languagetool-org/languagetool-browser-addon,languagetool-org/languagetool-browser-addon