Extension

Yes, I think most browser extensions can read and change the data on the websites you visit, especially if they require permissions to access your browsing data. This level of access is often necessary for them to function, but it can raise security and privacy concerns. I think the rule of thumb is simple: only install extensions you truly need. The fewer extensions you have, the fewer potential vulnerabilities. 😉

Also, a good practice is to stick to well-known extensions from reputable developers. Look for extensions with a high number of downloads and positive reviews, especially those recommended by trusted sources. The next recomendation is very important and I can't stress this enough: before installing any extension, carefully read the permissions requested by the extension. If an extension requests more permissions than you think it should need, it may be best to avoid it. Furthermore, some developers make their code publicly available, so if you or someone you trust has the skills to review the code, open-source extensions can be a good choice for security.

This goes without saying, always keep your extensions updated, as updates often include security patches. Also, I think another good security practice is to turn off extensions you don't require on sensitive websites, such as banking or financial sites.
I think the key takeaway here is to only install trusted extensions that enhance your privacy, like ad blockers, anti-tracking tools, and those that manage permissions, to minimize the data other extensions can access. Some browsers, like Firefox and Brave, are privacy-focused and offer enhanced security settings for extensions.

These would be my personal recommendations. Maybe other members can jump in on the thread to share their advice and insights regarding browser extensions, and other good security practices revolving around them.

Regards,

Alex