I've got the exact same issue in 3.7a5pre with http://www.articsilver.com/

I have the same problem with sites like Formula1.com

Same prob here. Gmail and goole maps is loaded as mobile version.

What is mozilla doing about this issue?

Now I have to use IE 8. Thanks!

Firefox sux arse!

And still nothing has been done or said about this issue.

Well I'm glad to see mozzila commited.

I guess it's time to move on to greener pastures, fcuk firefox!! I've had enough!

Anything else ?

Problem still exists in 3.7a6pre latest nightly build as of 6/14/2010 10:05 am EDT.

"Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now" "Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems --- You can also try "Reset all user preferences to Firefox defaults" on the Safe mode start window - See http://kb.mozillazine.org/Resetting_preferences

Have solution : type about:config in url, filter "useragent" and reset the general.useragent.extra.firefox works for me

I have tried all of the suggestion and nothing works. Does not happen with Chrome, but I cannot switch due to work. I cannot work with these mobile pages. Seriously losing time and money. Please help. Ff 5.0 on Win7 64bit laptop. Here are current useragent settings (Status default for all):

general.useragent.compatMode.firefox;false

general.useragent.extra.microsoftdotnet

general.useragent.locale;en-US

microsoft.CLR.all_clr_versions_in_useragent;false