Arc, Vivaldi, and other Chromium browsers

Arc

Arc is The Browser Company's reimagined Chromium browser. It accepts Chrome Web Store extensions natively, but the UI for managing them is hidden in places that aren't obvious if you're used to Chrome.

1. Open Arc.
2. Navigate to the FocusDragon listing on the Chrome Web Store (the same URL Chrome uses).
3. Click "Add to Arc". Confirm the permissions dialog.
4. To get to the extensions management page, type arc://extensions in the address bar — Arc remaps chrome:// URLs to arc://, but the underlying pages are the same Chromium screens.
5. Find FocusDragon → Details → "Site access" → "On all sites".

Pinning in Arc (sidebar quirk)

Arc has no top toolbar — extension icons live in the sidebar, in the top section above the tab list. To pin FocusDragon:

1. Click the puzzle-piece icon in the sidebar header.
2. Click the pin next to FocusDragon. It moves out of the popover and into the visible row of pinned extension icons in the sidebar.

Arc's "Little Arc" pop-out windows (the small windows that appear when you click external links) do load extensions, but with reduced UI. The FocusDragon icon won't be visible there — blocking still works, you just can't open the panel.

Vivaldi

1. Open Vivaldi.
2. Navigate to the FocusDragon listing on the Chrome Web Store.
3. Click "Add to Vivaldi". Confirm permissions.
4. Open vivaldi://extensions → FocusDragon → Details → "Site access" → "On all sites".
5. Pin via the puzzle-piece icon in the toolbar.

Vivaldi has its own "Tracker and Ad Blocker" — unlike Brave Shields, it does not interfere with extension content scripts in any version we've tested. No tweaks needed.

Opera

Opera ships with its own extension store and treats the Chrome Web Store as a third-party source. You need to install a small bridge extension first.

1. Open Opera.
2. Install the "Install Chrome Extensions" add-on from the Opera Add-ons store. (Yes, it's an extension whose only job is to let you install other extensions.)
3. Navigate to the FocusDragon Chrome Web Store listing.
4. Click "Add to Opera". Confirm.
5. opera://extensions → FocusDragon → Details → "Site access" → "On all sites".

Any other Chromium browser

If your browser is Chromium-based (Sidekick, Comet, SigmaOS, Wavebox, Thorium, Ungoogled Chromium, etc.) the general recipe is the same: find the equivalent of chrome://extensions, install from the Chrome Web Store (sometimes via a bridge extension), then set site access to "On all sites". If you can't install Chrome Web Store extensions at all in your browser, FocusDragon's URL-level blocking won't work there — fall back to DNS-level blocking and consider blocking the browser app itself at the macOS app level.