webNavigation.onErrorOccurred

browser.webNavigation.onErrorOccurred.addListener(
  listener,                   // function
  filter                      // optional object
)
browser.webNavigation.onErrorOccurred.removeListener(listener)
browser.webNavigation.onErrorOccurred.hasListener(listener)

Events have three functions:

addListener(listener)

addListener(listener, 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.

listener

The function called when this event occurs.

The listener function is called with these arguments:

details

object. Details about the navigation event. details has the following properties:

tabId

integer. The ID of the tab in which the navigation was happening.

url

string. The URL to which the given frame was navigating.

processId Optional Deprecated

integer. This value is never set in modern browsers. It used to represent the ID of the process running the renderer for this tab.

frameId

integer. Frame in which the navigation was happening.

0 indicates that navigation happened in the tab's top-level browsing context, not in a nested <iframe>.

A positive value indicates that navigation happened in a nested iframe.

Frame IDs are unique for a given tab and process.

timeStamp

number. The time at which the error occurred, in milliseconds since the epoch.

error

string. The error code. This is an internal error code, and is not guaranteed to stay the same or be consistent from one browser to another.

filter Optional

object. An object containing a single property url, which is an Array of events.UrlFilter objects.

If you include this parameter, then the event fires only for transitions to URLs which match at least one UrlFilter in the array.

If you omit this parameter, the event fires for all transitions.

Logs the target URLs for onErrorOccurred, if the target URL's hostname contains "example.com" or starts with "developer".

const filter = {
  url: [{ hostContains: "example.com" }, { hostPrefix: "developer" }],
};

function logOnErrorOccurred(details) {
  console.log(`onErrorOccurred: ${details.url}`);
  console.log(details.error);
}

browser.webNavigation.onErrorOccurred.addListener(logOnErrorOccurred, filter);