Hi   !

Maybe you'd like to give this add-on a try :

https://addons.mozilla.org/en-US/firefox/addon/picture-blocker/?src=ss

Here's what the developer says :

"In general the amount of downloaded data is reduced significantly on an image bloated webpage by using this addon. Pictures are not just hided."

Hi, Happy12.

Thanks for your reply. I use uBlock Origin and it has an option of not loading media that are bigger than X bytes (where you choose the "X").

Aside from images, what are the other big bandwidth-hogs of a webpage? For example, let's consider Facebook or Twitter. There seems to be a lot of invisible code that eat up a lot of bandwidth.

I was going to suggest uBlock Origin, but you already are using that
(good for you  !) ....

You could consider NoScript  :

https://addons.mozilla.org/en-US/firefox/addon/noscript/

And I found this add-on :

https://addons.mozilla.org/en-US/firefox/addon/save-data/

'About this Add-on' says :

"Tell websites that you prefer to save data and costs. At websites’ discretion, you may see lower quality images and fewer media elements as webpages adjust to reduce data downloads.

The extension works by sending the Save-Data: on HTTP header with every request. This extension is not a data compression proxy like the Data Saver option in Google Chrome, or Opera Turbo and Yandex.browser Turbo mode. "

Another thing you could do :

Type in the address bar :   about:config   (press Enter) (promise to be careful, if asked) Type and look for the preference :

network.prefetch-next

and if its value is set to 'true', then change it to false

Prefetching technology loads web contents that you may visit to speed up the page rendering time if you do. If you do not visit the prefetched web pages, bandwidth has been wasted.