That website specifies font face="palatino linotype"

You can force a specific font with the Stylish extension or code in userContent.css

• http://kb.mozillazine.org/userContent.css
• http://kb.mozillazine.org/Editing_configuration

• Stylish: https://addons.mozilla.org/firefox/addon/stylish/

Add quotes ("") around the font name if there are spaces in it.

@-moz-document domain(mercure.fltr.ucl.ac.be){
font[face="palatino linotype"]{
 font-family: "GFS Goschen" !important;
 font-style: italic !important;
 }
}

Thanks cor-el. Making progress, but not out of the woods yet.

0) I am using GFS Porson rather than GFS Goschen. I am sorry that I didn't specify that at the outset.

1) I used the Stylish extension. The font definitely changed (yeah!) but the letters are tilted as if they were Greek italics or something.

2) Every fifth line or so is closer together than the others.

3) Why does the code that you gave me have italic! rather than greek! (I know nothing about these codes I just found that curious.)

4) I still get no change at the two other sites that I use despite creating styles for both:

http://artflx.uchicago.edu/perseus-cgi/citequery3.pl?dbname=GreekFeb2011&query=Dem.%209.1&getid=0

http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.01.0069%3Aspeech%3D9%3Asection%3D1

You can leave out that line ( font-style: italic !important;) and only specify the font-family.
The GFS Porson font looks italic, at least the lower case characters.

Each site will require its own code if you only want to use it for the greek text or you can try to use the font for everything by using;

body, body *{ font-family: "GFS Porson" !important; }

@-moz-document domain(mercure.fltr.ucl.ac.be){
font[face="palatino linotype"] { font-family: "GFS Porson" !important; }
}

@-moz-document domain(www.perseus.tufts.edu){
.greek { font-family: "GFS Porson" !important; }
}

@-moz-document domain(artflx.uchicago.edu){
#perseuscontent { font-family: "GFS Porson" !important; }
}

Wow. That's great. I am amazed. I am blown away. You are so great. I should have come here right away. I would wash your car for you. Honestly! If you ever need any help with Ancient Greek or guitar, lemme know! Thank you, thank you, thank you.

You're welcome

I am still having one last problem. When I go to a chicago page like this:

http://perseus.uchicago.edu/perseus-cgi/citequery3.pl?dbname=GreekTexts&getid=0&query=Polyb.%201

Everthing is nice and the font looks great.

But if you click on a word and do a couple more quick clicks you get a dictionary entry in a pop up window.

http://artflx.uchicago.edu/cgi-bin/philologic/getobject.pl?c.20:5:6.LSJ

But this doesn't have the Porson font. (You click on the word a couple of times and any of the dictionaries but I used LSJ.)

I have tried altering the domain names somewhat to no avail.

There is no #perseuscontent ID on that page, so you need to look at the page source to see which selector(s) to use.

This seems to working good enough on that page.

@-moz-document domain(artflx.uchicago.edu){
.foreign, quote[lang="greek"] {
 font-family: "GFS Porson" !important;
 font-size: 14pt !important;
}
}

Once again. Thank you very much.

You're welcome