Cryptotab is a Chrome Based browser with build in mining function, You can mine using this browser for some extra passive BTC.
From now until September 1 2019 they are also having a huge giveaway for those who join and participate. To participate you need to download and install the browser, then invite others to do the same.
If you have invited 3 people who have installed the browser you will be entered to win $10 in free Bitcoin.
If you invite more people you could win one of the top prizes!
This is 100% free to participate in. I use Cryptotab browser everyday to get a little extra Bitcoin doing nothing :)
Image courtesy of pixabay.com