I don't know how to make the resolution smaller, but rather than doing that,
you could adjust things like font sizes. For the system, you can adjust the
fonts under Advanced Settings to make them bigger, and for Abrowser, you can
go to Preferences, Content tab and adjust the default font size from 16 to 24
or something.
For Abrowser, since a lot of websites seem to like to specify a particular
exact font size for some reason, it might be better to zoom in rather than
adjusting the font, which you can do with Ctrl-= or Ctrl-+. If you don't need
site-specific zoomings, you can type "about:config" in the URL bar, search
for "browser.zoom.siteSpecific", and set that to false, and I think that
might keep you from having to adjust the zoom level for every new site (I
can't say for sure). Even better would be to be able to set the default zoom
level to something other than 100%, but I don't know of a way to do that.
Alternatively, you can set the text to something big by default, and zoom in
for websites that don't comply (and Abrowser will remember that zoom level
for that website next time).
Hopefully you can get to the resolution you want, but in the meantime, I hope
this helps.
