Ken wrote:
NFN Smith wrote:


One more vote for PrefBar.  Yes, you have to periodically update the list of browsers.

Smith
How do you do this????


I keep a PrefBar taskbar, which includes a drop-down for UA specification. That allows me to change the UA on demand.

To adjust UA strings, I right-click on that, and select "Edit button 'User Agent'.

That gives the list of UAs available, and I can edit from there.

Since I have Firefox, Chrome, Opera and PaleMoon all available on my computer (whether full installations or portable), I can find the UAs of current versions. Plus, I do some measure of spoofing of operating system. In particular, I keep one setting that shows Firefox 68 with Mac Mojave, to allow for downloading at sites that support both Windows and Mac, but use browser sniffing to decide which download that they're going to give you (and assuming that you're installing immediately). By spoofing O/S, I can download Mac versions of stuff that I keep in my downloads archive.

I also have one UA setting that shows Firefox 60 and Seamonkey 2.53.1, which I use on sites that complain about Firefox 52 and Seamonkey 2.49.5.

One other place that I make occasional use of browser spoofing is if I'm testing access filters on the web page I maintain. There's a lot of forged stuff that's from botnet access, and by temporarily showing a bad UA that I recognize from the logs, I can verify if my filters are correctly rejecting access that shows that particular UA. One that I've seen a lot of over the last couple of years is accesses that claim to be "Firefox 40.1" (a version of Firefox that was never valid), and setting Seamonkey to show that one allowed me verify that the web site is rejecting those accesses.

Although the most common reason for spoofing (especially by a Seamonkey user) would be to get around sites that are demanding current versions of Firefox, there's other useful things that you can do with spoofing.

Smith

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