Videos are a tricky one, as most of the blockers out there only stop them from showing, but not still loading and using the data anyway. For most websites that start playing videos automatically, which seems to be an ever increasing number, I tend to switch to a reader view. Granted, it can look a little funny, but I can still read the content of the page without the video loading or playing. It doesn't work for all sites, but when trying to read a news site or the like it definitely comes in handy.
"For most websites that start playing videos automatically, which seems to be an ever increasing number, I tend to switch to a reader view. "
You can install browser add-ons that will switch to reader mode.
What do you do for sites that don't offer reader mode?
Like maratsade, I would suggest checking out reader view type extensions for Firefox. I don't use Firefox, but I've no doubt they have a few like that. This way you can more or less "force" a reader view on demand if the built in one doesn't give you the option to enable it on certain pages.