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The manifest.json file is a JSON-formatted file, and is the only file that every extension using WebExtension APIs must contain.

Using manifest.json, you specify basic metadata about your extension such as the name and version, and can also specify aspects of your extension's functionality, such as background scripts, content scripts, and browser actions.

manifest.json keys are listed below:

 

"manifest_version", "version", and "name" are the only mandatory keys. "default_locale" must be present if the "_locales" directory is present and must be absent otherwise. "applications" is not supported in Google Chrome, and is mandatory in Firefox before Firefox 48 and Firefox for Android.

Browser compatibility

ChromeEdgeFirefoxFirefox for AndroidOpera
applicationsNoNo4848No
authorYesYes *5252Yes
backgroundYesYes *48 *48 *Yes
browser_actionYes *Yes *48 *55 *Yes *
chrome_settings_overridesYesNo55 *NoNo
chrome_url_overridesYes *No54 *54 *Yes *
commandsYes *No48 *NoYes *
content_scriptsYes *Yes48 *48 *Yes *
content_security_policyYesYes *48 *48 *Yes
default_localeYesYes4848Yes
descriptionYesYes4848Yes
developerNoNo5252Yes
devtools_pageYesNo54NoYes
homepage_urlYesNo4848Yes
iconsYesYes4848Yes
incognitoYesNo48 *48 *Yes
manifest_versionYesYes4848Yes
nameYesYes4848Yes
omniboxYesNo52NoYes
optional_permissionsYes *No55 *55 *Yes *
options_uiYes *No52 *NoYes *
page_actionYes *Yes *48NoYes *
permissionsYesYes *48 *48 *Yes
protocol_handlersNoNo54 *54 *No
short_nameYesYes4848Yes
sidebar_actionNoNo54 *NoYes *
themeYesNo55NoNo
versionYes *Yes4848Yes
web_accessible_resourcesYesYes4848Yes

Example

Quick syntax example for manifest.json:

{
  "applications": {
    "gecko": {
      "id": "addon@example.com",
      "strict_min_version": "42.0"
    }
  },

  "background": {
    "scripts": ["jquery.js", "my-background.js"],
    "page": "my-background.html"
  },

  "browser_action": {
    "default_icon": {
      "19": "button/geo-19.png",
      "38": "button/geo-38.png"
    },
    "default_title": "Whereami?",
    "default_popup": "popup/geo.html"
  },

  "commands": {
    "toggle-feature": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "linux": "Ctrl+Shift+U"
      },
      "description": "Send a 'toggle-feature' event"
    }
  },

  "content_security_policy": "script-src 'self' https://example.com; object-src 'self'",

  "content_scripts": [
    {
      "exclude_matches": ["*://developer.mozilla.org/*"],
      "matches": ["*://*.mozilla.org/*"],
      "js": ["borderify.js"]
    }
  ],

  "default_locale": "en",

  "description": "...",

  "icons": {
    "48": "icon.png",
    "96": "icon@2x.png"
  },

  "manifest_version": 2,

  "name": "...",

  "page_action": {
    "default_icon": {
      "19": "button/geo-19.png",
      "38": "button/geo-38.png"
    },
    "default_title": "Whereami?",
    "default_popup": "popup/geo.html"
  },

  "permissions": ["webNavigation"],

  "version": "0.1",

  "web_accessible_resources": ["images/my-image.png"]
}

 

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