The 'YAM Allowlist Manager' is a Chrome extension designed to offer controlled browsing. It blocks all pages from sites that are not included in your list of permitted ones, improving safety and privacy. Its highlights include synchronization of your allowed list across all devices and potential to block content from unapproved sites.
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YAM is an open-source, privacy-focused website manager. You create a list of allowed websites, and this extension will block access to all pages that are not in that list.
The list is synchronized through Chrome to all of your devices, so you can log into Chrome with your child's account, add or modify entries in the list and they will synchronize in near real-time to a child's computer.
You can also choose to block all content from other sites, but this requires a more complex configuration since many pages require content from other sites to operate correctly.
I am searching for a solution for long time with pfsense. This is an easy way but the problems i found is
1.user can unistall the plugin
2.user can disable plugin
It was more trouble than it was worth, its not dynamic it blocked websites if they weren't precise so if I said block everything except youtube.com it would block all videos because its its not "youtube.com" but of course you have the video tag link and everything so you would have to add each individual video to safe list, same with webpages it blocked a page because I didn't add a "/" at the very end of the link. Needs some work.