Almost perfect extension. It just needs 3 more things to become perfect: 1) The 'Adjust Line Space Factor' setting should be configurable on a per-site basis (as well as a global default setting) just like the zoom factor and the minimum font size setting. 2) That 'Adjust Line Space Factor' setting should always be a 'minimum setting': it shouldn't be applied to text that already holds a greater line space factor. 3) One should be able to completely deactivate/activate the extension's operation on a given tab by means of the the Firefox UI's button, in case the extension could not deliver a good layout for that tab's content. Actually these ended up being the 3 reasons that had me try to find another extension, even though I wanted to use Zoom Page WE