I made a small fix to hide the images in the notifications tab.

Simply install the add-on "Stylus":
(Chrome and Brave) -
https://chrome.google.com/webstore/detail/stylus/clngdbkpkpeebahjckkjfobafhncgmne
(Firefox)  - https://addons.mozilla.org/firefox/addon/styl-us/

Then, go to https://userstyles.world/style/12288/baraag-notification-images
And click on the "install" blue button under the screenshot. 

 If you want the images to be way smaller instead, try this one out https://userstyles.world/style/12289/baraag-smaller-notification-images