Firefox hangs when opening PDF files?
The best thing you can do is install the PDF download extension for Firefox.
Once the PDF Download extension has been installed, you’ll be provided some options whenever you click on a link to a PDF file. With PDF download, you can just download the PDF file directly, without having to open it in Firefox, thereby lessening the chance of Firefox hanging.

Additionally, you can view the PDF as plain HTML using the PDF download extension.
So, if Firefox crashes when opening PDF files, it’s time to give PDF download a try.
Firefox Addon - Resurrect Pages
Sometimes while browsing the web we might stumbled upon pages which are not available for browsing. This can happen for a number of reasons: the link is “broken”, the entire website is experiencing technical difficulties, the web site was slahdotted or dugg and it’s therefore anavailable.
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Multiple Home pages in Firefox
Firefox features the possibility to set multiple home pages. This can be specially handy if you maintain a personal page in both Google and Yahoo (or others), and you would like to have them open by default when you start your browser.
Be aware that this new feature introduces a performance degradation in Firefox startup as multiple pages are open.
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