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Install disper (in Arch-based systems it is in AUR). Various commands available with this utility HERE. The command to cycle between clone, extended, internal and external displays should be like this: disper --cycle-stages='-e : -c : -S : -s' --cycle In that case, it would extend to the right. To cycle between the same options but extend to the left: ...
There are several ways, but I think the easiest is to install the NoSquint Extention, which lets you set a default zoom level (for text and overall separately, if needed), and also makes it easy to adjust on a site-by-site basis.
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