If you find yourself in a situation where your traffic volume is limited, then surfing the Internet can hit your balance very hard. One surfing on sites for half an hour can take about 200 MB.
To reduce this expense, you can disable uploading images that are larger than X KB. You specify the X value yourself.
Done. Your browser will consume less traffic. If you want to roll back everything as it was, go back to the same menu and uncheck the box. The restrictions will apply to all types of media: audio, video, gif, and images.