Use Alt+1 to Alt+9 Keys to open defined webpages on new tab (Alt+Shift+1 for current tab).
Exactly what I want.

Could you add an ability to swap alt+1 and alt+shift+1 functionality?

Thanks. I was looking foreward to this extension since speed dial was unavailable after the Quantum Update.

Thank you! Finally i can browse faster in FF57.
Note: After i save a new URL in Settings, i have to restart FF.