This extension blocks unwanted sites.
This extension allows you to block websites specified via regular expressions.
For example, to block YouTube:
1. Open options by clicking on the extension’s icon.
2. Click the add button.
3. Write `youtube.com` in the newly added text field.
4. Enable the rule by marking the checkbox on the left of your rule.
The extension will now block every URL that has `youtube.com` and redirect the window to a Wikipedia page on Akrasia.
The extension is basic and I built it to be extremely simple so that I could allowlist it on my employer’s machines to block distracting internal sites. I couldn’t use other external extensions (e.g., Freedom, BlockSite) for that purpose.