Cannot open htm files in Firefox

Running Firefox 16.0.1 under Win7. I am not sure when this problem started. In earlier versions of Firefox, this was not an issue.
I can open saved htm files in IE, but not in Firefox.
Any help would be appreciated.

When I enter about:preferences#applications <Enter> in the address bar, then for PDF it shows:
pdf File (application/x-download) ... Use Adobe Acrobat Professional
pdf File (application/x-pdf) .... Use Adobe Acrobat Professional
Portable Document Format (PDF) ... Save File'''
I would like all PDF's to open in Adobe Acrobat 8 Professional.
Right now none of the PDF's open at all, so opening in Firefox or any other viewer would be preferred over not showing up at all.

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pdf File (application/x-download) ... Use Adobe Acrobat Professional
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Hello,
Have you tried, to start Firefox in safemode you can do so by following these steps
'''If Firefox is open,''' you can restart in Firefox Safe Mode from the Help menu:
* Click the menu button [[Image:New Fx Menu]], click Help [[Image:Help-29]] and select ''Restart with Add-ons Disabled''.
'''If Firefox is not running,''' you can start Firefox in Safe Mode as follows:
* On Windows: Hold the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac: Hold the '''option''' key while starting Firefox.
* On Linux: Quit Firefox, go to your Terminal and run ''firefox -safe-mode'' <br>(you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
When the Firefox Safe Mode window appears, select "Start in Safe Mode".
;[[Image:SafeMode-Fx35]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, theme, or hardware acceleration. Please follow the steps in the [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] article to find the cause.
''To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
When you figure out what's causing your issues, please let us know. It might help others with the same problem.

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fomamac2guy wrote:
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Message was edited by: Herschel Hochman

Out of curiosity, I used the latest Firefox 3.6 to open a webarchive file. The Firefox "Open File" requestor allows you to tell it to use Firefox to open the file, but it doesn't open it. Doesn't give any error. When I go through Finder, and double-click the file, it opens in Safari. When I use "Open with" in Finder itself to tell it to use Firefox, Firefox is greyed out as an application.
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Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
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# Next Generation Java Plug-in 1.6.0_21 for Mozilla browsers
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Cannot open htm files in Firefox

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