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The Font Information add-on provides a "Fonts" panel in the Page Info dialog, listing all fonts actually used in the page, and whether they are locally-installed fonts or downloadable webfonts loaded using @font-face. For WOFF-packaged webfonts, it also displays metadata such as license details (if provided in the WOFF file).

In addition, the add-on creates a "Show Fonts in Selection" command in the right-click (context) menu for web pages, so that you can determine exactly which fonts are being used - after taking CSS styles, preference settings, and system fallback into account - for any given range of text on the page.

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