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[lem3]

The problem was the "Valence" extension, a "Firefox add-on that is installed by default with Firefox Developer Edition" I have no idea why it's installed on my system.

[therube]

So this "Valence" extension installed in FF (?) was affecting SeaMonkey?


(BTW, never realized SeaMonkey had that "screenshot" tool.
Otherwise, there are a number of third party, general purpose screenshot tools out there that can capture "scrolling" web pages. FastStone is one.)

[lem3]

No, the extension had somehow been installed in SeaMonkey.

[therube]

I will note that FF "webextensions" can be "installed" into SeaMonkey (2.53), you can probably even open their "Options" page (something like: moz-extension://66049df9-0563-4b30-8e32-492919e8cc90/ui/options.html) - though they (obviously) will not work.