TTFs from Glyphs3 not working in older Firefox

Since Glyphs 3, the TTFs don’t render in my old Firefox (44.0.2)/Win10 any more.
Turns out it’s because of overlap=1 flag in the GLYF table (left: TTF from Glyphs 2):

As soon as I delete those flags + GSUB and GPOS tables, the fonts render again.
Could you remove this from the static fonts?

That is fixed already. The update will be published very soon.

(I wonder why someone might use an old version of Firefox. Isn’t that dangerous?)

Thank you, Georg! I just like the idea of backwards compatibility, as long as there’s no good reason that speaks against it.