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Type Array
Mandatory No
"permissions": [

Use as chaves de permissão para obter privilégios especiais em sua extensão. Essas chaves são armazenadas em um array de strings, e cada string solicita uma permissão.

Se você solicitar permissões usando tais chaves, o navegador poderá informar aos usuários que a extensão a ser instalada está solicitando certos privilégios , e pede a eles que confirmem se aceitam ou não fornecer esses privilégios . O navegador também poderá permitir que o usuário inspecione os privilégios da extensão depois que essa for instalada.

As chaves poddem conter três tipos de permissões:

  • host permissions
  • API permissions
  • the activeTab permission

Host permissions

Host permissions are specified as match patterns, and each pattern identifies a group of URLs for which the extension is requesting extra privileges. For example, a host permission could be "*://*".

The extra privileges include:

  • XMLHttpRequest and fetch access to those origins without cross-origin restrictions (even for requests made from content scripts)
  • the ability to inject scripts programmatically (using tabs.executeScript) into pages served from those origins
  • the ability to receive events from the webRequest API for these hosts
  • the ability to access cookies for that host using the cookies API, as long as the "cookies" API permission is also included.
  • bypass tracking protection if the host is a full domain without wildcards. Doesn't work with <all_urls>.

In Firefox, from version 56 onwards, extensions automatically get host permissions for their own origin, which is of the form:


where 60a20a9b-1ad4-af49-9b6c-c64c98c37920 is the extension's internal ID. The extension can get this URL programmatically by calling extension.getURL():

// moz-extension://60a20a9b-1ad4-af49-9b6c-c64c98c37920/

API permissions

API permissions are specified as keywords, and each keyword names a WebExtension API that the extension would like to use.

The following keywords are currently available:

  • activeTab
  • alarms
  • background
  • bookmarks
  • browserSettings
  • browsingData
  • contentSettings
  • contextMenus
  • contextualIdentities
  • cookies
  • debugger
  • dns
  • downloads
  • find
  • geolocation
  • history
  • identity
  • idle
  • management
  • menus
  • nativeMessaging
  • notifications
  • pageCapture
  • pkcs11
  • privacy
  • proxy
  • sessions
  • storage
  • tabHide
  • tabs
  • theme
  • topSites
  • webNavigation
  • webRequest
  • webRequestBlocking

In most cases the permission just grants access to the API, with the following exceptions:

activeTab permission

This permission is specified as "activeTab". If an extension has the activeTab permission, then when the user interacts with the extension, the extension is granted extra privileges for the active tab only.

"User interaction" includes:

  • the user clicks the extension's browser action or page action
  • the user selects its context menu item
  • the user activates a keyboard shortcut defined by the extension

The extra privileges are:

  • the ability to inject JavaScript or CSS into the tab programmatically, using browser.tabs.executeScript and browser.tabs.insertCSS
  • access to the privileged parts of the tabs API for the current tab: Tab.url, Tab.title, and Tab.faviconUrl.

The intention of this permission is to enable extensions to fulfill a common use case, without having to give them very powerful permissions. Many extensions want to "do something to the current page when the user asks". For example, consider an extension that wants to run a script in the current page when the user clicks a browser action. If the  activeTab permission did not exist, the extension would need to ask for the host permission <all_urls>. But this gives the extension more power than it needs: it could now execute scripts in any tab, any time it likes, instead of just the active tab and just in response to a user action.

Clipboard access

There are two permissions which enables the extension to interact with the clipboard:

  • clipboardWrite: write to the clipboard using document.execCommand("copy") or document.execCommand("cut")
  • clipboardRead: read from the clipboard using document.execCommand("paste")

See Interact with the clipboard for all the details on this.

Unlimited storage

The unlimitedStorage permission:

  • enables extensions to exceed any quota imposed by the storage.local API
  • in Firefox, enables extensions to create a "persistent" IndexedDB database, without the browser prompting the user for permission at the time the database is created.


 "permissions": ["*://*"]

Request privileged access to pages under

  "permissions": ["tabs"]

Request access to the privileged pieces of the tabs API.

  "permissions": ["*://*", "tabs"]

Request both of the above permissions.

Browser compatibility

ChromeEdgeFirefoxFirefox for AndroidOpera
Basic support Yes Yes4848 Yes
activeTab Yes No4848 Yes
alarms Yes No4548 Yes
background Yes No No No Yes
bookmarks Yes1545 No Yes
browserSettings No No5656 No
browsingData Yes No5356 Yes
clipboardRead Yes No5454 Yes
clipboardWrite Yes No5151 Yes
contentSettings Yes No No No Yes
contextMenu Yes Yes551 No Yes
contextualIdentities No No5353 No
cookies Yes Yes4548 Yes
debugger Yes No No No Yes
downloads Yes No4748 Yes Yes No4848 Yes
find No No57 No No
geolocation Yes Yes5454 Yes
history Yes No49 No Yes
identity Yes No53 No Yes
idle Yes154548 Yes
management Yes No5151 Yes
menu No No53 No No
nativeMessaging291550 No16
notifications Yes No4548 Yes
pageCapture Yes No No No Yes
pkcs11 No No58 No No
privacy Yes No5454 Yes
proxy No No5555 No
sessions Yes No52 No Yes
storage Yes Yes4548 Yes
tabs Yes Yes4554 Yes
theme No No55 No No
topSites Yes No5252 Yes
unlimitedStorage Yes Yes5656 No
webNavigation Yes Yes454817
webRequest Yes Yes4548 Yes
webRequestBlocking Yes Yes4548 Yes

1. Available as an alias to the menus permission.

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Colaboradores desta página: Weslei
Última atualização por: Weslei,