to fix your dashboard and make gifs and edits look not blurry or cropped on your dashboard install Stylish (chrome, firefox) and then this userstyle
ETA: according to lallybroch-lass, you can also install Stylish for Safari and use the userstyle there. Instructions: “Safari users first install Stylish and its S-icon appears left of the URL bar. Click that, a small drop-down menu will appear. In it, click the button Find More, and a new tab will open up with a list of extensions that can be used together with Stylish. The extension: Fix New Tumblr Photo Width will be among the top ones. Click ‘install’ and voila.”
to fix your blog [no blurry, cropped, or chopped off gifs] use this script in your theme code (via jumpingpuddles) note: there are other bits of code floating around to fix your theme, but this is the only one i’ve found that fixes everything.
HOW TO PROTEST
use the contact form on the tumblr help page (to get the contact form, type “contact” in the box and a Contact Support button will appear at the bottom)
I don’t usually ask my followers to do this, but if you want optimal viewing of my GIFs and edits, please use the above scripts to fix your dashboards and blogs.
I have already done my part by fixing the post dimensions in my blogs. As a GIF/graphic maker, reverting your displays back means a lot to me already. If you don’t want to do so, and find my edits stretched to LQ ones, it’s always your choice to follow me or not.