Classic Theme Restorer 1.7.5

CTR_v1.7.5.xpi points internally to a Github update url, so only browsers not requiring add-ons signing will get updates automatically (like Waterfox).

CTR_v1.7.5_fx45-56_not_signed.xpi is the default file like always. Its update url does not point to Github. A workaround is required to install it on Firefox 52-56.

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[fix(es)]

• macOS: appbutton popup > show correct/localized "Quit " item
• old search: restored Alt+Up/Down functionality to open search engine popups

[general change(s)]

• appbutton icons > added icons for HiDPI modes