I've already lost 110 open tabs in a browser (3 times). Please, can you put in the menu - save open tabs. Or something like this. Slimjet always crashes in the following case. After that, "restore tabs in last session" or "--restore-last-session" doesn't help.
How to crash Slimjet - open youtube.com, next - you click with the right mouse button on a video and drag diagonally on the screen to another video {a green line is visible} and release the pressed button. If it doesn't work the first time, it will work after a few tries.