Latest version in both browsers
Very weird indeed. Could be an extension interfering? It’s something to do with the Javascript on that page. Or maybe somebody inserted some Javascript in one of the posts that is messing with the editor. I guess it’s not a big deal as long as it’s just that one page.
Understanding how to correctly size images is a bit of worthwhile knowledge. If seeing an image that you consider too large or small and then getting into a twist about it is just silly. Maybe not everyone knows what is considered an appropriate size to post. Older people can not see as well as teens and young adults. A large image can be helpful to us old farts. Peace.
Can understand 264. I normally use a 50 or 70% width modifier, sometimes 100% if the image resolution is big. However, there are always ways to see an image properly sized, at least outside of pages with blocking code like 
Bangbad. You can long tap or right click on images and download them, open them in a new window and or do with them whatever the browser or software you use allows to. So no big deal I think. 
Images that break the page layout are indeed annoying.
So are huge file size.
If it comes from a phone or a digital camera it is important to downsize the image before uploading it. A 1024 pixel wide image with moderate jpeg compression will be much less then a megabyte. I do it with Paint, save as same name with _1024 suffix. If i only need to show part of the image i crop it before resizing if it is still too large.
I think some picture hosting sites provide links to smaller versions of uploaded files, but i never used one, so not sure.
Huge file size is only a piece of the puzzle, it can be a burden but generally isn't for a single or a couple images. I do not usually reduce picture resolution, but I often crop them. By cropping the image you trim it down precisely removing what you don't need, while setting the meat at the forefront. :THUMBS-UP: