Before posting anything, try to find out if someone already posted on the same issue you are facing. Chances are, someone already did. You might find your answer there and you don't have to repeat the thread.
You are now looking to know about staying online. It's not mandatory to stay online all day long which is already discussed more than a thousand times. If you could have searched the forum, you could find the answer already and you didn't have to post it again.
However, Fiverr never encourages us to stay online. All it says is to reply to customer's inquiries faster. In that case, if you just use a mobile app, that's enough. Or you can stay online when you tweak your profile or gig or visit the forum and educate yourself.
Another thing, the extension you are using is not officially released by Fiverr, and using such an extension will bring you nothing but if Fiverr can make sense you are cheating, you may be penalized. It's just a prejudice to stay always online. There are a lot more, if you want to educate yourself have a walk through this post.