Bug#842952: firefox: Things that are still bad with GTK+3 enabled

[anomie at users.sourceforge.net]

One thing that has really been bugging me is that the buttons in
webpages are crazily large, breaking the layout of sites that expect
buttons to have more normal dimensions. Selection lists, input fields,
checkboxes, and radio buttons are also enough larger to be annoying.

In 49.0-4:
button:    31x18; padding: 0 6px; border-width: 2px
select:    15x17; padding: 0;     border-width: 2px 19px 2px 2px
input:    180x16; padding: 1px;   border-width: 2px
checkbox:  13x13; padding: 0;     border-width: 3px 3px 3px 4px
radio:     13x13; padding: 0;     border-width: 3px 3px 0 5px
textarea: 156x44; padding: 0 1px; border-width: 2px

In 49.0-5:
button:    31x18; padding: 0 6px; border-width: 4px 16px
select:    15x17; padding: 0;     border-width: 5px 24px 5px 9px
input:    180x16; padding: 1px;   border-width: 0px 8px
checkbox:  16x16; padding: 0;     border-width: 3px 3px 3px 4px
radio:     16x16; padding: 0;     border-width: 3px 3px 0 5px
textarea: 156x44; padding: 0 1px; border-width: 1px

As far as I can tell it's using the default Adwaita:light theme. If this
won't be fixed or able to be disabled in Firefox, is there at least a
packaged theme available that I could specify with the GTK_THEME
environment variable to have normal-sized form widgets instead?

Also, in the browser itself, I find that the indicator for submenus
inside menus is sometimes (but not always) white-on-white so it's
invisible until the menu item is moused over. This happens with the
default browser theme.