CKEditor doesn't show up due to useragent rejection

[WouterK]

At my own (Drupal-based) website, Tycho Alpha 2 doesn't display the CKEditor toolbar (4.5.10 = latest version),
whereas PM 26.4.0 does. (Compare the two attached screenshots.)
The latest versions of Firefox, Chrome and IE 11 show the toolbar too.

The reason CKEditor rejects Tycho turns out to be Tycho's useragent string:

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Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:3.0) Gecko/20100101 Goanna/20160728 PaleMoon/27.0.0a2

However, with an override for my website set to PM 26.4.0's useragent, Tycho does display the toolbar:

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Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:38.9) Gecko/20100101 Goanna/2.1 Firefox/38.9 PaleMoon/26.4.0

Comparing the two, my first thought was that CKEditor needs "Firefox/38.9", but adding that to Tycho's string doesn't help.
What does help, is raising "rv:3.0" to "rv:4.0" or higher.

In fact, I think I've found the code rejecting rv 3.0 in ckeditor.js:

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b.isCompatible=!(b.ie&&7>c)&&!(b.gecko&&4E4>c)&&!(b.webkit&&534>c)

When I temporarily changed !(b.gecko&&4E4>c) to !(b.gecko&&3E4>c), the toolbar reappeared.

I don't know the reason why rv was lowered to 3.0 in Tycho, but I think it breaks all instances of CKEditor.

Sorry for bringing up yet another of those horrid useragent headaches...

[New Tobin Paradigm]

Our rv: version tries to be as accurate as possible to our actual engine version.

However, we have enhanced, extended, and unified the UA compatibility options to a simple tri-mode preference.

Try Firefox compatibility from the drop down. That will give you the most compatibility with UA sniffing for Firefox.

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Native: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:3.0) Goanna/20160909 PaleMoon/27.0.0a2
Gecko: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:3.0) Gecko/20100101 Goanna/20160909 PaleMoon/27.0.0a2
Firefox: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.9) Gecko/20100101 Goanna/3.0 Firefox/45.9 PaleMoon/27.0.0a2

Though, I don't know why you believe this is a problem with us.. This is obviously a deficiency in CKEditor and one easily resolved on their side as you have so effectively demonstrated.

[Moonchild]

This should be brought up with the CKEditor people and fixed on their side. they should remove this ancient check since Firefox with a Gecko version < 4 is not something you should even consider in your scripting anymore. And if people still use FF 3.5 (Gecko 1.9), then that is entirely on them. Still, if CKEditor devs want to keep this check for archaic compatibility reasons, it should simply be changed to "if less than 2" because in Gecko land, v2.0 and above is FF4+.