To get the Google Browser Sync plugin to work on Firefox in Windows Vista, you might be facing compatibility issues with the operating system. Google Browser Sync was discontinued by Google and is no longer officially supported, so it may not work as intended on newer versions of Firefox or on older operating systems like Windows Vista. Here are a few suggestions that might help you address the login issue: 1. Check for Alternative Solutions: Since Google Browser Sync is no longer available, consider using other similar extensions or services that offer synchronization features for Firefox. 2. Compatibility Mode: Try running Firefox in compatibility mode for Windows Vista. Right-click on the Firefox shortcut, go to...