This plugin adds some software that make https://search.rspark.com/?twd the default browser :@
Nothing change at "default browser" tab, so it's some type of malware. I solicite Firefox to try it and delete from the list of availables plugins.

doesn't work

Only adds an icon that doesn't do anything. All this addon can do is change your "New Tab" options.

Don't even think about installing this add on without knowing that it puts search.rspark.com on all new tabs. NOT COOL! I couldn't care less if the rest of the add-on works.

The author says to email for instructions on how to remove search.rspark.com. No, that's not good enough. It cost me more than 2 hours to figure out what caused this intrusive change to my new tab.

سيء جدا

Spamware

Loads
search.rspark.com
EVERY time you open a new tab.

Does not do anything, does not download videos as promised.
Forces every window and/or page to go to a third party search engine.

Loads
search.rspark.com
EVERY time you open a new tab.

so - misleading Crapware.