Here are some tips to help you safely download and install browser extensions:

1. Check the extension for compatibility with your web browser version.
2. Check the number of users who have verified the extension.
3. Read carefully the permissions requested by the extension for your web browser.
4. Download the extension from a reputable source.
5. Use caution when installing extensions from unknown developers.
6. Keep your web browser and installed extensions up-to-date.