Here’s how to always open Firefox with previously open tabs.
Firefox, like other web browsers, won’t remember by default you opened tabs. When you close the app, all your tabs are gone.
But here is a simple option to correct this and make Firefox always open with those tabs that you left open when close the app.
Just open the main menu and click on options. In the configuration window, you have to enable the very first option – “Restore previous session”.
That all there is to it. And if you want to go back to the default way of handling tabs, just disable the very same option.