The Simple Steps to Convert Manifest V2 to V3 for Chrome Extensions

Chrome is deprecating the Manifest v2 From June 2024. And this post will show you the steps to convert your extension with Manifest v2 to Manifest v3.

Google has given enough time to migrate to v3. The v3 manifest was first introduced in Dec 2020 (Chrome version M88 Beta), and Google has given developers more than 3 years for phasing out v2.

Changes required to Convert v2 Manifest to V3 for Chrome Extensions

The most changes you need are in the manifest.json:

Changes required to Convert v2 Manifest to V3 for Chrome Extensions

Here are the details required to modify for manifest.json

manifest_version

This needs to be changed to 3 (from value 2)

browser_action

This needs to be renamed to “action”

web_accessible_resources

The v2 manifest looks like:

"web_accessible_resources": [
  		"js/*", 
  		"images/*",
  		"bs/*"
],

For v3 manifest, it has to be updated to:

"web_accessible_resources":  [{
    "resources": ["js/*", "images/*", "bs/*"],
    "extension_ids": ["olpihmabpjpllgmahlgiakkgaccigpfo"]
}],

background/scripts

This needs to be changed from v2:

"background": {
    "scripts": ["js/background.js"]
},  

to v3 manifest:

"background": {
    "service_worker": "js/background.js"
},

That is the minimum requirement to convert the v2 Manifest to v3. However, you might need more changes for v3, as there are other requirements such as restricted APIs, for more information, please see Manifest V3

For example, the eval function is not supported in Google Chrome Extension Manifest v3 anymore (see this).

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