tabs.onUpdated

Fired when a tab is updated.

When the user navigates to a new URL in a tab, this typically generates several onUpdated events as various properties of the {{WebExtAPIRef("tabs.Tab")}}  object are updated. This includes the url, but also potentially the title and favIconUrl properties. The status property will cycle through "loading" and "complete".

This event also fires for changes to a tab’s properties that don’t involve navigation, such as pinning and unpinning (which updates the pinned property) and muting or unmuting (which updates the audible and mutedInfo properties).

You can filter this event, making it only fire for tabs whose URLs match specific patterns, changes to particular properties, changes to a tab or window, or any combinations of these restrictions.

Syntax

browser.tabs.onUpdated.addListener(
  listener, // function
  filter     // optional object
)
browser.tabs.onUpdated.removeListener(listener)
browser.tabs.onUpdated.hasListener(listener)

Events have three functions:

• addListener(callback, filter)
  • : Adds a listener to this event.
• removeListener(listener)
  • : Stop listening to this event. The listener argument is the listener to remove.
• hasListener(listener)
  • : Check whether listener is registered for this event. Returns true if it is listening, false otherwise.

addListener syntax

Parameters

• listener

  • : The function called when this event occurs. The function is passed these arguments:

    • tabId
      • : integer. The ID of the updated tab.
    • changeInfo
      • : object. Properties of the tab that changed. See the changeInfo section for more details.
    • tab
      • : {{WebExtAPIRef('tabs.Tab')}} . The new state of the tab.

• filter {{optional_inline}} 

  • : object. A set of filters that restrict the events sent to this listener. This object can have one or more of these properties. Events are only sent if they satisfy all the filters provided.

    • urls

      • : Array. An array of match patterns. Fires the event only for tabs whose current url property matches any one of the patterns.

    • properties

      • : Array. An array of strings consisting of supported {{WebExtAPIRef("tabs.Tab")}}  object property names. Fires the event only for changes to one of the properties named in the array. These properties can be used:

        • “attention”
        • “autoDiscardable”
        • “audible”
        • “discarded”
        • “favIconUrl”
        • “hidden”
        • “isArticle”
        • “mutedInfo”
        • “openerTabId”
        • “pinned”
        • “status”
        • “title”
        • “url”

        [!NOTE] The “url” value has been supported since Firefox 88. In Firefox 87 and earlier, “url” changes can be observed by filtering by “status”.

    • tabId

      • : Integer. Fires this event only for the tab identified by this ID.

    • windowId

      • : Integer. Fires this event only for tabs in the window identified by this ID.

Additional objects

changeInfo

Lists the changes to the state of the tab that is updated. To learn more about these properties, see the {{WebExtAPIRef("tabs.Tab")}}  documentation. Note that not all {{WebExtAPIRef("tabs.Tab")}}  properties are supported.

• attention {{optional_inline}} 
  • : boolean. Indicates whether the tab is drawing attention. For example, attention is true when the tab displays a modal dialog.
• audible {{optional_inline}} 
  • : boolean. The tab’s new audible state.
• autoDiscardable {{optional_inline}} 
  • : boolean. Whether the tab can be discarded by the browser. The default value is true. When set to false, the browser cannot automatically discard the tab. However, the tab can be discarded by {{WebExtAPIRef("tabs.discard")}} .
• discarded {{optional_inline}} 
  • : boolean. Whether the tab is discarded. A discarded tab is one whose content has been unloaded from memory but is visible in the tab strip. Its content gets reloaded the next time it’s activated.
• favIconUrl {{optional_inline}} 
  • : string. The tab’s new favicon URL. Not included when a tab loses its favicon (navigating from a page with a favicon to a page without one). Check favIconUrl in tab instead.
• hidden {{optional_inline}} 
  • : boolean. True if the tab is {{WebExtAPIRef("tabs.hide()", "hidden")}} .
• isArticle {{optional_inline}} 
  • : boolean. True if the tab is an article and is therefore eligible for display in Reader Mode.
• mutedInfo {{optional_inline}} 
  • : {{WebExtAPIRef('tabs.MutedInfo')}} . The tab’s new muted state and the reason for the change.
• openerTabId {{optional_inline}} 
  • : integer. The ID of the tab that opened this tab, if any. This property is only present if the opener tab exists and is in the same window.
• pinned {{optional_inline}} 
  • : boolean. The tab’s new pinned state.
• status {{optional_inline}} 
  • : string. The status of the tab. Can be either loading or complete.
• title {{optional_inline}} 
  • : string. The tab’s new title.
• url {{optional_inline}} 
  • : string. The tab’s URL, if it has changed.

Examples

Listen for and log all the change info and new state:

function handleUpdated(tabId, changeInfo, tabInfo) {
  console.log(`Updated tab: ${tabId}`);
  console.log("Changed attributes: ", changeInfo);
  console.log("New tab Info: ", tabInfo);
}

browser.tabs.onUpdated.addListener(handleUpdated);

Log changes to URLs:

function handleUpdated(tabId, changeInfo, tabInfo) {
  if (changeInfo.url) {
    console.log(`Tab: ${tabId} URL changed to ${changeInfo.url}`);
  }
}

browser.tabs.onUpdated.addListener(handleUpdated);

Filtering examples

Log changes only to tabs whose url property is matched by https://developer.mozilla.org/* or https://mastodon.social/@mdn:

const pattern1 = "https://developer.mozilla.org/*";
const pattern2 = "https://mastodon.social/@mdn";

const filter = {
  urls: [pattern1, pattern2],
};

function handleUpdated(tabId, changeInfo, tabInfo) {
  console.log(`Updated tab: ${tabId}`);
  console.log("Changed attributes: ", changeInfo);
  console.log("New tab Info: ", tabInfo);
}

browser.tabs.onUpdated.addListener(handleUpdated, filter);

Log changes only to the pinned property of tabs (that is, pin and unpin actions):

const filter = {
  properties: ["pinned"],
};

function handleUpdated(tabId, changeInfo, tabInfo) {
  console.log(`Updated tab: ${tabId}`);
  console.log("Changed attributes: ", changeInfo);
  console.log("New tab Info: ", tabInfo);
}

browser.tabs.onUpdated.addListener(handleUpdated, filter);

Combine both the previous filters, log only when the pinned property of tabs changes for tabs whose url property is matched by https://developer.mozilla.org/* or https://mastodon.social/@mdn:

const pattern1 = "https://developer.mozilla.org/*";
const pattern2 = "https://mastodon.social/@mdn";

const filter = {
  urls: [pattern1, pattern2],
  properties: ["pinned"],
};

function handleUpdated(tabId, changeInfo, tabInfo) {
  console.log(`Updated tab: ${tabId}`);
  console.log("Changed attributes: ", changeInfo);
  console.log("New tab Info: ", tabInfo);
}

browser.tabs.onUpdated.addListener(handleUpdated, filter);

Log changes only when the pinned property of tabs changes for tabs whose url property is matched by https://developer.mozilla.org/* or https://mastodon.social/@mdn where the tab was part of the current browser window when the update event fired:

const pattern1 = "https://developer.mozilla.org/*";
const pattern2 = "https://mastodon.social/@mdn";

const filter = {
  urls: [pattern1, pattern2],
  properties: ["pinned"],
  windowId: browser.windows.WINDOW_ID_CURRENT,
};

function handleUpdated(tabId, changeInfo, tabInfo) {
  console.log(`Updated tab: ${tabId}`);
  console.log("Changed attributes: ", changeInfo);
  console.log("New tab Info: ", tabInfo);
}

browser.tabs.onUpdated.addListener(handleUpdated, filter);

{{WebExtExamples}} 

Browser compatibility

{{Compat}} 

[!NOTE] This API is based on Chromium’s chrome.tabs API. This documentation is derived from tabs.json in the Chromium code.

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