Mozilla has released Firefox 19 for Mac today. The updated web browser offers a number of bug fixes, however it's the new HTML5 PDF viewer that users will immediately notice. Firefox users will no longer be required to download Adobes Reader PDF plugin -- something which could be buggy and slow to load. The new PDF viewer built into Firefox 19 is built using HTML5 so it's pretty snappy.
Unless they're really into web development, the average user probably won't find any of the other updates too appealing. Here's the full release notes:
Built-in PDF viewer
Canvas elements can export their content as an image blob using canvas.toBlob()
Startup performance improvements (bugs 715402 and 756313)
