Open the link in a new tab. The following settings are possible ・Follow the web page settings (Firefox Initial Settings) ・Open a link to a different site on a tab ・Open all links with tabs I was inspired by the following great add-ons, developed as an add-on for Firefox 57 or later. Open Link with New Tab https://addons.mozilla.org/ja/firefox/addon/open-link-in-new-tab