For their part, Crossrider CEO Koby Menachemi jumped in and addressed the situation, and basically says that the app is safe. RougeDarkJedi still disagrees, so we guess it’s up to the user to make the choice of using the add-on. For users who did install but want to take it out here are the instructions:
Uninstall the add-on via the Firefox add-ons manager.
Go to about:config.
Reset all the values in about: config for the following:
Go to tools.
Select Google+Facebook and hit uninstall.
Press alt, select tools.
Click on manage extensions.
Find Google+Facebook and press disable.