What's removed?...Followers and Radar in the right column, footer icons (ignore/reblog/like buttons), text-only posts, conversation posts, recommended posts, notes, videos, audio, advertisements, and maybe other stuff. I *only* use Tumblr for viewing pictures, and I don't write posts or comment or anything, so that's why they're removed.

Also, it's assumed that HTTPS is enabled, which is currently the default on Tumblr.

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April 21st, 2015 update:

• changed "compose" button (SVG icon) to gray

March 9th, 2015 update:

• fixed site source background color (next to tags at footer of post)
• removed sticky avatars in Google Chrome
• removed "Buy for $xx.xx" button, and posts with vendor button
• removed sponsored ad (.remnant-unit-container)

January 26th, 2015 update:

• removed CSS variables requirement (should work in browsers other than Firefox now, but haven't tested)
• changed background color of the animated dog ear effect
• fixed header background color

January 14th, 2015 update:

• removed sticky avatars (again)
• changed right column menu background color to gray (hover/selected)

January 8th, 2015 update:

• removed sticky avatar images, and its blue background
• changed avatar background color to gray for images with alpha channel

October 31st, 2014 update:

• fixed header background color
• removed the "sticky" header so it's not always at the top even after scrolling
• added padding to "main content area" (the darkest part that surrounds all posts)
• changed colors of the "compose" button (pencil icon in header)
• removed "recommended" posts (I consider it spam since I didn't ask to see them)

October 18th, 2014 update:

• fixed search box background color and border radius

September 20th, 2014 update:

• removed sponsored posts (ads)