I'm trying to use '%s' to show the user marked text in the context menu in my newly created Webextension/addon. This page: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/contextMenus/create stated that it would literally show the marked text. "You can use "%s" in the string. If you do this, and some text is selected in the page when the context menu is shown, then the selected text will be interpolated into the title. For example, if title is "Translate '%s' to Pig Latin" and the user selects the word "cool", then activates the context menu, then the context menu item's title will be: "Translate 'cool' to Pig Latin"." It, however, adds '...' to the selected text. I've already updated the MDN page to reflect my findings: (...)context menu item's title will be: "Translate 'cool...' to Pig Latin". I've already tried everything, truncation, string replacement, none of it is working because '%s' in the title field is evaluated last. More info: https://stackoverflow.com/questions/4376167/text-selection-and-display-in-context-menu-chrome-extension Extra testing: I've tried using '%s' in chrome and it works flawlessly there. Not sure why Firefox is not playing along. Please help, it's driving me nuts. Thank you. Sincerely,