On 4/5/2016 12:40 PM, Paul B. Gallagher wrote:
> Richard Owlett wrote:
>> On 4/5/2016 12:40 PM, OG wrote:
>>> While in SeaMonkey for newsgroups (mail) I click on a posted link
>>> and SeaMonkey opens its web browser.
>>> Unfortunately SeaMonkey cannot handle the web page.
>>>
>>> So how do I tell SeaMonkey Mail to open say FireFox as the defaut?
>>
>> As to your explicit question -- I don't know.
>>
>> But your question raises a perhaps more important set of questions.
>>
>> What site(s) display in FireFox but not SeaMonkey?
>> What version of:
>>     SeaMonkey?
>>     Firefox?
>> What is your OS?
> 
> OP's user agent string, from his email headers:
> 
> User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101
>   Firefox/43.0 SeaMonkey/2.40
> 
> 

That makes me think the Web server is sniffing for the user agent (UA)
string and doing it very badly.  Any Web page that can be displayed
appropriately by Firefox 43 should also be displayed appropriately by
SeaMonkey 2.40.  However, there are a number of Web servers that examine
the entire UA string and cannot handle a case where both "Firefox" and
"SeaMonkey" are found.

I work around this problem by using the PrefBar extension.  It has a
menu that allows me to spoof browsers other than my chosen SeaMonkey.
Among those other browsers are Firefox 45.0.  But first I try the UA
string:
        Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101
                SeaMonkey/2.40, NOT Firefox/45.0
Sometimes, Web servers that sniff for the UA string only examine the
last field, in this case "Firefox/45.0".

-- 
David E. Ross

While many tributes to the late Supreme Court Associate Justice
Antonin Scalia now fill the news media, his legacy was not
necessarily positive.  See my "What Price Order, Mr. Justice Scalia?"
at <http://www.rossde.com/editorials/edtl_scalia_wrong.html>.
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