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Retrieves a value previously stored by a call to sessions.setTabValue.

You can retrieve a value from a tab even over a close/restore cycle: meaning that if you set a value, then the user closes the tab, then restores the tab using the browser's "restore tab" feature (for example, by pressing Control+Shift+T), then you will be able to retrieve the value from the restored tab. Note, though, that a restored tab does not get the same ID as the original, so the ID you pass into getTabValue() will be different from the ID you passed into setTabValue(), even though they both refer to the same tab.

This is an asynchronous function that returns a Promise.

Syntax

var retrieving = browser.sessions.getTabValue(
  tabId,    // integer
  key       // string
)

Parameters

tabId
integer. ID of the tab whose data you are trying to retrieve.
key
string. Key identifying the particular value to retrieve. This needs to match the key previously given in sessions.setTabValue.

Return value

A Promise that will be resolved with the value if it exists, or undefined if it does not exist. If the call failed (for example, because the tab ID could not be found) then the promise will be rejected with an error message.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxOperaFirefox for Android
getTabValueChrome No support NoEdge No support NoFirefox Full support 57Opera No support NoFirefox Android No support No

Legend

Full support  
Full support
No support  
No support

Examples

Log the value of "my-key" for all newly created tabs (this will include any tabs that have been restored):

function onGetResolved(r) {
  console.log(`success: ${r}`);
}

function onGetRejected(e) {
  console.log(`error: ${e}`);
}

browser.tabs.onCreated.addListener((tab) => {
  browser.sessions.getTabValue(tab.id, "my-key").then(onGetResolved, onGetRejected);
});

Example extensions

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