Should I remove vendor prefixes?

Question

I have a website which I support as far as IE8, no further.

When I first launched the site, I decided to use CSS vendor prefixes for CSSs elements such as border-rad

Answer 1

Our approach is to drop those which aren't needed.

border-radius
box-shadow

box-sizing (soon? firefox still uses it. Noted by @James Donnelly)

opacity (not a prefix, but no need for the ms-filter thingie)
inline-block (same here, no need for inline+zoom fix)