Capital One just offered me $45 to install a Firefox extension. I declined, though I'm sort of tempted to get paid for getting spied on which I assume is happening anyway. And who knows, maybe I could get a couple more bucks later in the class action.
https://addons.mozilla.org/en-US/firefox/addon/wikibuy-for-f...
Their offers are very hard to claim - only eligible to be used in their store, only given after making a purchase in their store, among other random strings. I tried to claim the same offer but could never actually get it.