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Please see the instructions in the Emacs Keybindings section of the MozillaZine Knowledge Base. In short, if you use Gnome, you can set this using the "Text editing shortcuts" selection in the Applications -> Preferences -> Keyboard Shortcuts menu. If, for some reason, that doesn't work try typing the following at the command line:
gconftool-2 --type string \ --set /desktop/gnome/interface/gtk_key_theme Emacs
If you are using GNOME from an ACS Linux desktop system, you can run add_firefox_url_handlers.sh from the command line.
We are still looking into this. In the meantime, it is possible to RightClick on a link and select "Save Link As...".
When using Firefox on Linux, every time you click on a link to a PDF document the PDF will open inside your web browser. You were probably expecting to see a dialog box, offering you two options:
By following these instructions, you can disable the Acrobat plug-in for Firefox. Afterwards, Firefox will present the usual dialog when you click on a PDF Document. You will then be able to open PDF Documents in a separate window.