Okay then, here's an alternative approach that uses a Modify HTTP Response filter to expand margin-inline and padding-inline.
The scrollbar at the top is due to overflow-y: scroll; it seems Firefox removes this if there's no content.
Didn't track down what's going on the with recommended stuff.
CODE:
[["a.kickstarter.com",["/\\.css$/",["/(padding|margin)-inline:(.*?)([;}])/g","$1-inline-start:$2;$1-inline-end:$2$3"]]]]Didn't track down what's going on the with recommended stuff.