Google Chrome

1. Unzip the file you downloaded (double-click it on a Mac; on Windows, right-click it and choose “Extract All”). You get a folder named vidlingo-sync-0.4.1. Keep it somewhere it can stay, such as your Documents folder: Chrome reads the extension from that folder every time it starts.
   vidlingo-sync-0.4.1.zipvidlingo-sync-0.4.1
2. Type chrome://extensions into the address bar and press Enter.
   chrome://extensions
3. Turn on Developer mode with the switch at the top right.
   ExtensionsDeveloper mode
4. Click Load unpacked and choose the unzipped folder (the one with manifest.json inside). VidLingo Sync appears in the list. Reload this page and the box at the top turns green.
   Load unpackedPack extensionUpdate

Chrome may sometimes show a box when it starts, offering to turn off extensions in developer mode. Close it (the × or “Cancel”) to keep VidLingo Sync. If you turned it off by mistake, switch it back on in chrome://extensions.

Microsoft Edge

Best from Microsoft Edge Add-ons (see “Install it from a store”), which keeps it up to date and works in mainland China. To add the download yourself instead, follow the same steps at edge://extensions: Developer mode is in the panel on the left, and Load unpacked appears at the top.

360 Secure Browser and QQ Browser

Both are built on Chrome's engine, so it should work like Chrome: open the browser's extensions page, turn on developer mode and load the unzipped folder. We haven't been able to check every version yet; if it doesn't work, tell us at hello@vidlingo.io.

Updating

A copy added this way doesn't update itself. When there is a newer version, the box at the top of this page says so: download it, unzip it over the old folder (replacing its files), then click the reload arrow on VidLingo Sync's card in chrome://extensions. Copies from a store update themselves.