Download the extension
It isn't on the Chrome Web Store yet. Until then you can download the file and load it into Chrome in developer mode: four steps, two minutes.
The zip contains only the files the extension needs to run: the manifest, the background script, the content script, the side panel and the icons. The same source always produces the same checksum.
Setup
Extract the archive
Extract the zip you downloaded. It contains a single folder named iwatchuwatch; put it somewhere permanent. If you delete or move the folder, the extension goes with it.
Open the extensions page
Type chrome://extensions in the address bar. This address can't be opened from a link; you have to type it yourself.
Turn on developer mode
Flip the switch at the top right of the page. That setting is what lets Chrome load an extension from outside the store.
Load unpacked
Press the button at the top left and pick the iwatchuwatch folder you extracted. The extension appears in the list; click its toolbar icon to open the side panel.
What to know
- Chrome shows a “Disable developer mode extensions” warning every time it starts. You can dismiss it; the extension keeps working.
- An extension installed this way does not update itself. When a new version comes out, download it here, overwrite the same folder, then press the reload icon on the chrome://extensions page.
- Once it is published on the Chrome Web Store, installing from there is better: updates arrive on their own. You can remove this folder then.
Verify the file
If you want to be sure the download isn't corrupted, compare the checksum. It should match the sha256 above.
Get-FileHash -Algorithm SHA256 .\iwatchuwatch-0.3.0.zipshasum -a 256 iwatchuwatch-0.3.0.zip