The mimimum font size setting in Preferences -> Display works randomly. In some sites (like current one) it works, but on others doesn't (like http://www.altavista.com/). There are sites too where this setting either works or doesn't on different portions of the site or when page is reloaded.

try:

user_pref("font.minimum-size.x-western", 13); feed in via user.js

else try: userContent.css ( > Profiles > .... chrome

html>body { font-size: 20px !important; }

further info at http://www.mozilla.org/unix/customizing.html#userContent

You will also find further info via forum search. I do not think it is a bug.

I have read existing forum topics on this theme before I write. As far as I understand the problem is not new, but is not clear stated.

The minimum font setting in Preferences window sets all configs at desired value. It must works without further tweaks. Nevertheless I tried the steps You recommended, but result was the same.

If it is a bug it in in GRE which comes from Mozilla - we could not do much.
It should be sure easier and better documented if it is no bug.

I did not critzise or suggest that You did not read in Forum.
It was an info where You can look to get answer without delays.

the following is quoted from:
http://kmeleonbrowser.org/forum/read.php?f=1&i=20638&t=20637

user_pref("browser.display.use_document_fonts", 0);
user_pref("font.default", "sans-serif");
user_pref("font.minimum-size.x-unicode", 16);
user_pref("font.minimum-size.x-western", 16);
user_pref("font.name.cursive.x-unicode", "Tahoma");
user_pref("font.name.cursive.x-western", "Tahoma");
user_pref("font.name.fantasy.x-western", "Tahoma");
user_pref("font.name.monospace.x-unicode", "Tahoma");
user_pref("font.name.monospace.x-western", "Tahoma");
user_pref("font.name.sans-serif.x-unicode", "Tahoma");
user_pref("font.name.sans-serif.x-western", "Tahoma");
user_pref("font.name.serif.x-unicode", "Tahoma");
user_pref("font.name.serif.x-western", "Tahoma");
user_pref("font.size.fixed.x-unicode", 16);
user_pref("font.size.fixed.x-western", 16);

You'll notice that the very first user_pref is set to "0". This turns ALL page fonts off and forces the browser to use ONLY the fonts that you have listed below within those parameters. Most should find a size 16 large enough if they're sitting about 12" (30cm) away from their screen (I sit about 20cm from mine).

I think Eyes-Only´s sttings should still work. He had very bad eysight.

possibly if my other css idea did not work - You can try alternatively in css:

font { font-size: 20px !important; }

I only do html css normally - so ...

All this works on sites where minimum font size setting works too. On the others change only fonts style but not size.

In SeaMonkey and Firefox this feature works properly.

We use the same GRE so in theory it should work here too.
I wonder which pref is missing or set differntly.

btw - it works at altavista German version with the browser i use - so maybe system specific or You give better example url.

Is there a way to set minimum font size just for printing?