Thicker fonts

[krm]

Fonts is an issue with Firefox in Windows. Some sites fonts are very thin. Changing settings in about:config doesn't give results. Specially in Google Maps, the fonts become thin after loading completely.

[Jon]

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[mark2090]

You have not said if you tried to use the Fonts settings in Firefox to see if that makes a difference.

Go to: Settings > General > scroll to Fonts > click Advanced button > (popup opens)

In the popup set the font style, size, and type you want.
There is No "bold" or "italic" setting, you have to choose a font type that renders automatically as bold (i.e: "Agenda BoldCondensed").

There is a selection at the bottom of that popup that says:
"Allow pages to choose their own fonts, instead of your selections above"

That selection, when checked, will allow webpages to control their own font appearances ignoring your Firefox font settings.

Uncheck that selection, and your settings in Firefox will over-ride the website, at least for most of them.
The changes are immediate, no reloading of pages is necessary to test different fonts.

If that is unsatisfactory, there is the option with an extension. 
The best one I found is named: "Stylus".

It is located here:
https://addons.mozilla.org/en-CA/firefox/addon/styl-us/?utm_source=addons.mozilla.org&utm_medium=ref...

If you know how to write CSS, you can modify specific webpages or generally (means most all webpages) the font type, style, size, bold, italic, etc, and modify a lot more with CSS. 

The extension can use a URL for specific changes to a chosen website or without a targeting URL to apply to all websites.

That extension is very good and has allowed me to deal with websites I regularly visit whose CSS is poorly written or has layout issues, which includes Google Search results (i.e: changing link colors that are visited). 

With that extension, it is best to know how to use the Firefox built-in Web Developer Tool (CTRL+SHIFT+I) (or F12), to read the source code of a website in order to find specific CSS entries so you can target them for CSS changes.

Remember, if you write or build websites or webpages, this extension will alter its appearance when it is left On. Just turn it off when working on your own webpages or turn off specific CSS entries in the extension. You will see how it works so well.