Set as default search engine:

• install
• open http://shortmarks.com/
• click magnifier icon in search bar ➜ add shortmarks
• click magnifier again ➜ search settings
• make shortmarks default search engine


Set as New Tab page:

• enter about:config in address bar
• search for newtab.url
• replace value with http://shortmarks.com/s.php
• install https://neco.so/static/js/shortmarks.user.js to make new tabs look like before