Build a direct download link for any Chrome Web Store extension, so you can fetch the .crx file from Firefox, curl, or any other browser and side-load it into a Chrome that has no internet access. Paste a store URL or a bare extension ID.
The default serves the newest build. Lower it to the offline Chrome's own version if that Chrome is old — the store will then send the last release compatible with it.
CRX3 covers everything current. Allow CRX2 only if an old extension returns nothing.
If nothing downloads
The store returns an error when the extension ID does not exist or the extension has been removed, and an empty response when the target Chrome version above is below the extension's minimum. Either way no file is saved. This page cannot report which it was, because the store does not allow it to read the response — check the ID first, then try raising the version.
A .crx file is a ZIP archive with a signature header in front of it, which is why renaming works — archive tools read the index at the end of the file and ignore the header. Dropping the .crx straight onto the extensions page is refused by Chrome on Windows and macOS, so extract it instead. Note that an extension loaded this way gets a new ID, will not auto-update, and makes Chrome show a developer-mode warning at startup.
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