It’s an open-source browser extension which reduces the amount of data consumed when you browse web pages by compressing all images on the page. It uses data compression service to convert images to low-resolution WebP or JPEG images.
For more details see here
Steps:-
1 . Open heroku signup
Note: - select “Role” as "professional developer’ and primary language as “GO”.
(You can skip this step if you already have an account in heroku)
2 . Now do the mail verification and login to your account.
3. Click this link .
4. Click Deploy.
5. Name the app whatever you want.
6. After succesful deploy,copy the link (nameyouset.herokuapp.com) and paste the link in the extensions.You can use my link https://bandwithproxy15.herokuapp.com/ in case u dont want to deploy
For chrome - click here
For Firefox - click here
7. Modify the extension settings as you want.Black and white is set by default you can unclick it.
You will save tons of data with this trick
Please like my post if you find it useful.
!