A BrowserSetting object which determines whether the browser's context menu is shown on the mouseup event or on the mousedown event.

Its underlying value is a string that may be either "mouseup" or "mousedown".

The default value is "mouseup" on Windows, and "mousedown" on macOS and Linux. Assigning to it on Windows has no effect - the setting is only designed to allow the context menu to be opened on mouseup instead of mousedown, not the inverse.

Browser compatibility

ChromeEdgeFirefoxFirefox for AndroidOpera
Basic support No No5959 No


Set the setting to "mouseup":

function logResult(result) {
  console.log(`Setting was modified: ${result}`);

browser.browserSettings.contextMenuShowEvent.set({value: "mouseup"}).

Document Tags and Contributors

Contributors to this page: GijsKruitbosch, wbamberg
Last updated by: GijsKruitbosch,