gistfile1.txt

// test.js:

  dump("!!! ABOUT TO CALL UPGRADE\n");
  await extension.upgrade(extInfo("example", "Example", "2.0"));
  dump("!!! CALLED UPGRADE\n");


// ext-chrome-settings-overrides.js:

        dump("!!!! addSearchEngine - 4\n");
        // Get position of engine and store it
        let enginesList = await Services.search.getEngines();
        dump("!!!! addSearchEngine - 4.5\n");
        index = enginesList.map(engine => engine.name).indexOf(firstEngineName);
        dump("!!!! addSearchEngine - 5\n");
        await Services.search.removeEngine(firstEngine);


// console output

 0:01.93 pid:83858 !!! ABOUT TO CALL UPGRADE
 0:01.96 pid:83858 !!!! processSearchProviderManifestEntry
 0:01.96 pid:83858 !!!! addSearchEngine - 4
 0:01.96 pid:83858 !!! CALLED UPGRADE
 0:01.96 INFO exiting test
 0:01.97 pid:83858 !!!! addSearchEngine - 4.5
 0:01.97 pid:83858 !!!! addSearchEngine - 5
 0:01.97 pid:83858 !!!! RemoveEngine Called
 0:01.97 pid:83858 !!!! addEnginesFromExtension