"Customize…" menu item doesn't work in SeaMonkey
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custombuttons
From https://github.com/antonglv/custombuttons/issues/4
"Customize…" context menu item doesn't work in Seamonkey (tested in 2.25 and 2.26)
Diff:
# Fixed: [4e7c26]
There is 0.0.5.9pre1 build on Files page
Related
Commit: [4e7c26]