Why does my page show up poorly in Mozilla based browsers like Netscape and Firefox?

The .Net framework recognizes the capabilities of the latest version of the above browsers poorly. This is because, by default, the BrowserCaps section of the machine.config file (usually found under a folder like ‘C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\CONFIG’) declares the capabilities of the Mozilla based browser poorly. So, you will have to replace the default entry in your install with this one: Mozilla BrowserCaps.

In case the above link didn’t work, this is the content from the above link, captured as of (4/10/2005):

<browserCaps>


		<!-- 
		Name:		BrowserCaps update for modern browsers, http://slingfive.com/pages/code/browserCaps/
		Author:	Rob Eberhardt, http://slingfive.com/
		History:
			2004-11-19	improved detection of Safari, Konqueror & Mozilla variants, added Opera detection
			2003-12-21	updated TagWriter info
			2003-12-03	first published
		-->

			<!-- GECKO Based Browsers (Netscape 6+, Mozilla/Firefox, ...) //-->
			<case match='^Mozilla/5\.0 \([^)]*\) (Gecko/[-\d]+)(?’VendorProductToken’ (?’type’[^/\d]*)([\d]*)/(?’version’(?’major’\d+)(?’minor’\.\d+)(?’letters’\w*)))?'>
				browser=Gecko
				<filter>
					<case match='(Gecko/[-\d]+)(?’VendorProductToken’ (?’type’[^/\d]*)([\d]*)/(?’version’(?’major’\d+)(?’minor’\.\d+)(?’letters’\w*)))'>
						type=${type}
					</case>
					<case> 
						type=Mozilla
					</case>
				</filter>
				frames=true
				tables=true
				cookies=true
				javascript=true
				javaapplets=true
				ecmascriptversion=1.5
				w3cdomversion=1.0
				css1=true
				css2=true
				xml=true
				tagwriter=System.Web.UI.HtmlTextWriter
				<case match='rv:(?’version’(?’major’\d+)(?’minor’\.\d+)(?’letters’\w*))'>
					version=${version}
					majorversion=0${major}
					minorversion=0${minor}
					<case match='^b' with='${letters}'>
						beta=true
					</case>
				</case>
			</case>

			<!-- AppleWebKit Based Browsers (Safari...) //-->
			<case match='AppleWebKit/(?’version’(?’major’\d?)(?’minor’\d{2})(?’letters’\w*)?)'>
				browser=AppleWebKit
				version=${version}
				majorversion=0${major}
				minorversion=0.${minor}
				frames=true
				tables=true
				cookies=true
				javascript=true
				javaapplets=true
				ecmascriptversion=1.5
				w3cdomversion=1.0
				css1=true
				css2=true
				xml=true
				tagwriter=System.Web.UI.HtmlTextWriter
				<case match='AppleWebKit/(?’version’(?’major’\d)(?’minor’\d+)(?’letters’\w*))(.* )?(?’type’[^/\d]*)/.*( |$)'>
					type=${type}
				</case>
			</case>

			<!-- Konqueror //-->
			<case match='.+[K|k]onqueror/(?’version’(?’major’\d+)(?’minor’(\.[\d])*)(?’letters’[^;]*));\s+(?’platform’[^;\)]*)(;|\))'>
				browser=Konqueror
				version=${version}
				majorversion=0${major}
				minorversion=0${minor}
				platform=${platform}
				type=Konqueror
				frames=true
				tables=true
				cookies=true
				javascript=true
				javaapplets=true
				ecmascriptversion=1.5
				w3cdomversion=1.0
				css1=true
				css2=true
				xml=true
				tagwriter=System.Web.UI.HtmlTextWriter
			</case>

			<!-- Opera //-->
			<case match='Opera[ /](?’version’(?’major’\d+)(?’minor’\.(?’minorint’\d+))(?’letters’\w*))'>
				<filter match='[7-9]' with='${major}'>
					tagwriter=System.Web.UI.HtmlTextWriter
				</filter>
				<filter>
					<case match='7' with='${major}'>
						<filter>
							<case match='[5-9]' with='${minorint}'>
								ecmascriptversion=1.5
							</case>
							<case>
								ecmascriptversion=1.4
							</case>
						</filter>
					</case>
					<case match='[8-9]' with='${major}'>
						ecmascriptversion=1.5
					</case>
				</filter>
			</case>


		</browserCaps>