Here’s the custom filters for Adblock/Adblock Plus.
Add -> twitter.com##.stream-item:not(.open) .tweet .media
UPDATED DEC 17, 2013! (blocks normal *single* images)
Add -> twitter.com##.stream-item:not(.open) .tweet .multi-photos
UPDATED MAR 28, 2014 (blocks new multi-image tweet images)
Also Add -> twitter.com##.stream-item:not(.open) .tweet .js-tweet-details-dropdown
UPDATED MAR 31, 2014 (blocks vine)
Semi-Detailed instructions (verified in Chrome on OSX and Windows)
I initially tested in firefox too, but not with every update.
Install Adblock Plus or Adblock Extension (or both):
Add above in custom filters
If you have any difficulties, or need instructions for another browser, please feel free to ask me here or on Twitter. (@patrixmyth)
Have a good day!