制作 manifest.json 文件时 Chrome 扩展程序错误

Question

Hi i am trying to make a manifest.json file which has chrome.cookies permissions which i think is an api.

i tried to upload this code

{
    "manifest_version" : 2,
    "name" : "coding train extension",
    "version" : "0.001",
    "host_permissions":[
        "*://*.google.com"
    ],
    "permissions":[
        "cookies"
    ],
    "content_scripts":  [
        {
            "matches": [
                "<all_urls>"
            ],
            "js": ["content.js"]
        }
    ]
}

The code loaded successfully but got an error

what am i doing wrong?

Answer 1

Chrome extension must have exactly one manifest.json file, which is where you configure things such as name, description, permissions etc. See full guide to extension manifest for details, but I will walk you through what you have provided, to resolve the issues.

manifest_version

Chrome extension developers are currently (Oct 2021) undergoing a transition period, moving from manifest version 2 to version 3 . This transition introduces changes in how to construct a manifest (among other things), so when reading Chrome docs or questions here on SO, pay attention which manifest version it is in reference to.

"manifest_version" : 2

Above entry means "use (the old) manifest version 2" but I strongly suspect you want the new version 3:

"manifest_version" : 3

host_permission

(This key applies only to manifest version 3) It means you want to perform extension operations within the domain google.com and are requesting permission to do so. The array value "*://*.google.com" is called a match pattern , and the docs say "the path must be present in a host permission".

"host_permissions":[ "*://*.google.com" ]

so change it to include path:

"host_permissions":[ "*://*.google.com/*" ]

even though inchrome.cookies this is written differently (mistakes happen...!). After making these changes the extension should load for debugging without errors.

I have a few additional notes:

1. "version" : "0.001" numbering is unusual, and you will see this changes to 0.1 after the extension loads. I suggest you change it to say 0.1 also in the manifest.

2. From the manifest seems your intent it to work with cookies and plan to do so in content script. This is not going to work. Accessing the cookies API must be within the extension context in background or popup. Again, this is something to configure in the manifest, and I have added an example below.

Finally arriving to this:

{
  "manifest_version" : 3,
  "name" : "coding train extension",
  "version" : "0.1",
  "host_permissions":[
    "*://*.google.com/*"
  ],
  "permissions":[
    "cookies"
  ],
  "background": {
    "service_worker": "background.js"
  }
}

Here is an example cookie extension by the Chrome team, which you may find useful.