browserSettings.openBookmarksInNewTabs
A BrowserSetting object whose underlying value is a boolean.
If set to true, then when the user selects a bookmark, it will be opened in a new tab. If set to false (the default) bookmarks are opened in the current tab.
Browser compatibility
BCD tables only load in the browser
Examples
Set the setting to true:
js
function logResult(result) {
  console.log(`Setting was modified: ${result}`);
}
browser.browserSettings.openBookmarksInNewTabs
  .set({ value: true })
  .then(logResult);