Images not preloading anymore on the selected Tab
I'm expriencing this issue since a few days :
The images in the selected tab (the page I'm reading/scrolling into) don't preload anymore. A few days ago, when everything was fine, I was able to scroll through long pages and all the images were already displayed. Now, whenever I scroll down, the images appear with half a second delay. Once everything has been loaded/displayed once, I can scroll through the page with all the images displayed correctly so I guess this is a matter of Firefox not preloading what's not currently displayed even though it's in the currently read page.
Does anyone know how to fix this please?
Thank you a lot for reading.