MAKE YOUR INFO CLEARER

Congratulations! You just installed "SaveFrom.net helper" extension!

Then you said: "The extension button button will appear on your browser\'s extensions panel."
You don't explain what an extensions panel is.
I Google it. It appears to be something to do with Linux. Not Firefox or in Windows.
Maybe it doesn't matter. I test the browser and look for your cute green down-arrow.
No arrow.
That's it. No arrow, and a description of where to look that isn't documented and may not exist.
I'm out.
"Congratulations! You have just been uninstalled from my computer!"