Stumbi is the Safari version for StumbleUpon in Mozilla Firefox. But it has some other characteristics such as being able to be used only for a limited time. Then you have to pay for Stumbi, whereas StumbleUpon requires no paying at all.
So, when the limited time was over, I decided to delete Stumbi dmg(exe) file, but then I ran into problems. Safari started to crash. I could not find how to remove Stumbi from Safari tabs.
Later I have found the solution: You should go to the web page where you can download Stumbi and download it again. After the download, you will see a screen where you can choose between "installing" and "removing". And that's it! You choose removing and the problem is solved.
