Open Link with New Tab wot sienori

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