some pages in the admin panel don't open in firefox

salam and hello everyone
basically i have a problem with my wordpress blog admin page http://baskoot.fatafeet.net

the site itself displays just fine, but when i go to the admin sign-in page and write my username and password, it keeps loading without going anywhere. assuming the cookies have already been created, i tried going to another page in the admin panel that wasn’t the dashboard homepage, and it opened!
but only some pages work while others don’t (themes, new post and updates, for example) but the plugins page, the settings, users, etc just keep loading as if firefox is still trying to load the whole page.
all these pages work in chrome, mind you, but i don’t want to use chrome every time i want to make a post or edit something minor =\

in the firefox error console it tells me:

Warning: Error in parsing value for ‘background-image’. Declaration dropped.
Source File: http://baskoot.fatafeet.net/wp-admin/css/colors-fresh.min.css?ver=3.5.1
Line: 1

and same error for different values like zoom, filter, box-sizing.

I didn’t change anything in my wordpress installation (i even reinstalled the version i had already (newest) hoping for a bugfix)

it worked fine until recently, i didn’t install or install anything. i had a change in internet provider, does that make a difference? even though it seems my blog and one other website (a huge vb forum) are affected, not sure if they’re linked in any way. the vb forum doesn’t open at all while my admin pages open partially.

i don’t know if it’s a problem with the blog itself or firefox or my internet, as i’ve tried removing any spyware\viruses, uninstalling adblocks from my browser, allowing firefox through any firewall i might have on my computer (windows XP) and cleared the cash and cookies several times. i tried creating a new user in the blog and it had the same problems signing in (pages keep loading forever)

here’s some info:
wordpress version: 3.5.1
hosting: hostgator
blog language: arabic\english
system: windows XP
browser: firefox 20.0
internet provider: Mobily 4G (saudi arabia)
antivirus: avast

thank you for your time （´・ω・｀）