Comment 22 for bug 1312376

(In reply to Marzanna from comment #16)
> Configure options
>
> --host=x86_64-linux-gnu --enable-application=browser
> --enable-update-channel=release
> --with-l10n-base=/build/firefox-Y5qa6J/firefox-52.0.1+build2/./l10n
> --with-google-api-keyfile=/build/firefox-Y5qa6J/firefox-52.0.1+build2/debian/
> ga MAKE=/usr/bin/make --enable-crashreporter --disable-elf-hack --enable-gio
> --disable-install-strip --enable-official-branding --enable-optimize
> --enable-release --enable-startup-notification --disable-updater
> --prefix=/usr --with-distribution-id=com.ubuntu

I'm not seeing "--enable-default-toolkit=cairo-gtk3" in your configure flags, which I guess means you're not using a GTK3 build.

Are you using an official build of Firefox (downloaded from [1])? If not, where did you get your Firefox build from?

[1] https://www.mozilla.org/en-US/firefox/new/