Chrome是从哪里下载同步扩展程序的？

Question

Say I was to sign into a new user on Chrome and had extensions from a previous computer synced to my account. Where are these extensions downloaded from after I sign? I thought maybe update_url in manifest.json but I'm not sure.

Answer 1

Let's examine an actual sync payload through chrome://sync-internals/

"SPECIFICS": {
  "encrypted": true,
  "extension": {
    "disable_reasons": "0",
    "enabled": true,
    "id": "ijglncoabcgieiokjmgdogpefdblmnle",
    "incognito_enabled": false,
    "installed_by_custodian": false,
    "name": "Desktop Notifications for Stack Exchange",
    "remote_install": false,
    "update_url": "https://clients2.google.com/service/update2/crx",
    "version": "1.6.12"
  }
},

From this, Chrome does see the update_url , which it can query for the download URL according to auto-update protocol . Note that the actual extension is not hosted at that URL, that URL merely contains instructions on where to download it from. In this instance, the download will be from the Chrome Web Store.

It will also sync disabled status across instances: a disabled extension will still be downloaded, but will be disabled immediately.

Since non-enterprise versions can't install from anywhere but CWS, and non-CWS enterprise installs take their update_url s from policies and not Sync, I think the answer to your question is almost certainly "from CWS". Can't test it though.