Oh yeah now I remember why I keep uninstalling XKit – it literally doesn’t run for me. The xkit.info (top level url only – all the other pages work fine) is blocked on some level (get a 404 in the browser too). My ISP doesn’t have it on its ban list, my antivirus doesn’t block stuff… really, I have no idea what’s up except it doesn’t work and I can’t make it.
Oh nooooo. :( I’m so sorry – and sorry for being accidentally-super-unhelpful about PostBlock too.
Are you trying to install the new XKit or the old one, btw? This is the current one:
https://new-xkit-extension.tumblr.com/
The old (circa a couple of years ago) XKit doesn’t work anymore, but this is the one I’m running now, and it has all the features I used to use on the old one.
I got this too on my old computer. Massive pain. :( Eventually I *almost* got it to work on Firefox, but it was super glitchy and sometimes wouldn’t reblog when you pressed reblog, wouldn’t load stuff, all sorts