GNU stow is needed to install the dependencies onto your home directory.
To install:
make
make install
Other 3rd party dependencies to be installed by the OS dependency manager:
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In Slackware:
sun
Here are two configs used in the zen browser, found in ~/.zen/{profile_dir}>/prefs.js:
user_pref("zen.theme.content-element-separation", 0);
user_pref("zen.view.experimental-force-window-controls-left", true);