Installing it doesn't always pin it. Click the puzzle-piece icon at the right of your address bar, find ScarCam in the list, and click the pin next to it. It'll stay visible from then on.

Click the three dots (⋮) in the top-right of the browser window, then look for Extensions. In Chrome that opens a submenu with Manage Extensions; in Edge and Brave it goes straight to the extensions list.

Or just type chrome://extensions (or the matching edge:// / brave:// address) directly into the address bar and press Enter.

In Chrome and Brave, it's a toggle in the top-right of the extensions page, next to "Update". In Edge, it's on the left-hand sidebar, lower down. Once it's on, three new buttons appear, including Load unpacked.

This almost always means developer mode is still off — double-check the toggle from the step above.

If developer mode itself is greyed out, the computer is likely managed by a school or workplace that blocks it. In that case you'll need to use a personal device, or ask whoever manages the computer to allow it.

That warning appears on every unpacked, developer-mode extension — it's not specific to ScarCam. It means the extension hasn't gone through the Chrome Web Store's review, not that something's wrong. If you trust where you downloaded it from, it's safe to dismiss and continue.

Browsers sometimes flag a fresh download as unverified before letting you open it. Check your downloads bar or Downloads folder for a Keep or Keep anyway option, then try unzipping again. If it still fails, delete the file and download it again — it may have been interrupted partway through.

The switch only turns replacement on — it still needs a file to show. Open the popup and either drop in a file or pick one from a synced folder or GIF search. Once a file is selected, the switch takes effect immediately on open tabs, and on a brand-new getUserMedia request from then on.

If a call was already running before you installed the extension, refresh that tab once.

A few sites block video from loading this way due to their own security settings. Images and GIFs aren't affected. If a video won't play on a particular site, try a GIF or image there instead, or test a different video file.

Browsers forget folder access after a restart, as a privacy measure — this isn't a bug. Click Reconnect folder in the popup once and it'll stay connected again until the next restart.

Another extension or program may already use that combination. Go to chrome://extensions/shortcuts (or the matching address for your browser) to see or change ScarCam's shortcut.

To pause it, just flip the switch in the popup off — sites go back to seeing your real camera right away. To remove it completely, go to your browser's extensions page, find ScarCam, and click Remove.