NoSquint is a free Firefox extension that allows you to adjust the text-only and full-page (both text and images) zoom levels as well as color settings both globally (for all sites) and per site.
- Override the default text-only and full-page (both text and images) zoom levels for all websites.
- Enforce your own foreground and background colors.
- Remember your zoom levels and color settings per site, automatically applying them when you return..
- Disagree with what NoSquint calls a site? A powerful exceptions mechanism lets you split up or group together sites with URL patterns.