Speaking on the topic..
I too had difficulties with my firefox browser ..it didn't like the shop..
tried a few times..figured it was my settings..
rooted through them but couldn't find anything concrete to pin it to.
I wasn't about to spend all day figuring out the "why"...
I simply resorted to gurgle chrome to get the job done..
No prob with chrome browser.

edit: actually come to think of it that isn't a very clear answer..."it didn't like the shop"..hehe..
I had no prob with email's from the neoteam / neo ug with firefox...
Initially the 1st went into my junk folder until I set the browser to regard neoteam / neo ug email as ok. everything was fine since..
nor was navigating to the neo shop with firefox a problem.
My problem came inside the shop..
Firefox wouldn't open some pages.