Manifest V3 support needed urgently

[zzzatang]

Describe the issue you are experiencing
A clear and concise description of your issue:
Chrome is swithcing off Manifest V2 and The Chrome WebStore is warning that this extension would stop working.

How can the issue be reproduced?
Steps to reproduce the behavior:

1. Go to https://chromewebstore.google.com/detail/xbrowsersync/lcbjdhceifofjlpecfpeimnnphbcjgnc
2. See error: This extension may soon no longer be supported because it doesn't follow best practices for Chrome extensions.

Screenshots
If applicable, add screenshots to help explain your problem:

Desktop browser
Please complete the following information for all affected desktop browsers:

• OS: Win10
• Browser Chrome
• Version 127.0.6533.100 (Official Build) (64-bit)

Application log
Please include the logs from the affected clients:

Log entries