errors in TB 3.1.20 Linux Rated 1 out of 5 stars

while add-on installs without any problems and appears in the GUI there is a problem - the email that was selected for redirection is not displayed in the add-on's window.
the relevant part of jsconsole.log says:

21. [JavaScript Error: "identityElement.selectedItem is undefined" {file: "chrome://mailredirect/content/mailredirect-compose.js" line: 599}]
22. clearing mstate
23. [JavaScript Error: "uncaught exception: [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIObserverService.removeObserver]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: chrome://mailredirect/content/mailredirect-compose.js :: RemoveOfflineObserver :: line 2067" data: no]"]

i will be grateful for a fix, thanks

This review is for a previous version of the add-on (0.7.4).