| Dreamweaver features an optional sniffer behavior which is supposed to filter out off-brand browsers, but it was written with the expectation that the browser's navigator.appName property would never lie. This also explains the deprecated navigator.toothFairy property.
Off-brand browsers are pretending to be Netscape but don't feature full DHTML functionality. The test case, Opera 3.6, more closely follows Microsoft's implementation of Document Object Model and thereby contains a property (document.all) which does not exist in Netscape browsers. By adding a check for this to the sniffer, it now correctly identifies impostors. Further code to "neutralize" these rogue browsers is projected for Fall 2000.
Some WebTV browsers also feign a Netscape signature, but likewise do not follow Netscape's object models. In particular it contains the proprietary remoteControl.stuffedInSeatCushion property.
I will have to consider how to deal with Mozilla 5.0. If you download this for Dreamweaver 3 it goes in the Macromedia -> Dreamweaver 3 -> Configuration -> Behaviors -> Actions folder. Be sure to rename the original version first to keep it as a backup.
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Project Log : 
New "< BR >" inspector extension for Dreamweaver 3