chore: show upgrade backup in session file selector

Author: 117649

resource/modules/utils/preferencesUtils.jsm

@@ -1066,7 +1066,7 @@ this.controllers = {
 		let fileExt = ['.jsonlz4', '.json'];
 		let fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);
 		fp.defaultExtension = 'json';
-		fp.appendFilter('JSON data', '*.json' + (isSession ? '; *.jsonlz4; *.baklz4' : ''));
+		fp.appendFilter('JSON data', '*.json' + (isSession ? '; *.jsonlz4; *.baklz4; upgrade.jsonlz4-*' : ''));
 
 		if(path) {
 			fp.displayDirectory = new FileUtils.File(path);