How to Save a Link to keepthis.site from Your Browser

Install the keepthis.site browser extension for Firefox, keep the Mac desktop app running in the background, then click the extension's toolbar button on any page. That single click sends the active tab's URL, title, tags, and notes straight to the desktop app — no login or sign-up involved. The extension currently ships only for Firefox; a Chrome Web Store version is listed as "coming soon," so Chrome users have no supported path yet.

What you need before starting

• A Mac running macOS 12 or later with the keepthis.site desktop app installed and open. The extension page states the Mac app "has to be running in the background to receive the saves," so a closed app means clicks go nowhere.
• Firefox with the extension installed from Firefox Add-ons. The site notes the extension is "available now for Firefox."
• No account. The site explicitly says "No login, no sign-up," so there is no credential step to prepare.

Android is also listed as a download (Android 8+, arm64), but the extension workflow described on the page is tied to the Mac app receiving saves, so treat the extension as a desktop pairing.

Step-by-step: save your first link

1. Install the desktop app for Mac from keepthis.site and launch it. Leave it running — this is the receiver for everything the extension sends.
2. Install the Firefox extension from Firefox Add-ons. The page describes it as one click from your browser to save the current tab.
3. Open the page you want to keep — an article, doc, video, or tool.
4. Click the extension button in the toolbar. Per the page, this saves the active tab's URL, title, your tags, and your notes directly to the desktop app.
5. Confirm the save in the app. The page says every saved link gets a real screenshot of the page rather than a generic thumbnail, so a new entry with a preview image is your success signal.

What gets captured

Verify it worked

Open the desktop app and look for the new entry with its page screenshot. Then use the app's instant search — the site says you can find anything "in milliseconds — by title, by note, by anything you wrote about it." Searching a word from the title or your note is a quick end-to-end check that the save landed intact.

Common snags

• Click does nothing. The Mac app is almost certainly not running. The page is explicit that it must be running in the background to receive saves.
• You're on Chrome. There's no extension for you yet. The page only points to Firefox Add-ons and says Chrome Web Store is coming soon; it gives no date.
• You expected folders. There aren't any. The site says "No folders to maintain — search finds it," so organize with tags and notes instead.
• You're offline. Saves still work: "Pins live on your device. Open the app on a plane, save from a flaky connection — everything keeps working." Sync between your devices happens when connectivity returns.

A note on permissions and privacy

The extension requests only the activeTab permission, which the page describes as the only page permission it needs — it reads the current tab when you click, not your browsing history. Saved data is encrypted on your device with a passphrase only you know and syncs peer-to-peer between your own devices, with no server in between and no account. That design is why the setup above has no sign-in step; the trade-off is that your passphrase is the only key, so keep it somewhere safe.