Do you have that problem when running in the Firefox SafeMode? http://support.mozilla.com/en-US/kb/Safe+Mode Don't select anything right now, just use "Continue in SafeMode."

If not, see this: http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...

I have exactly the same problem and it is not irritating. . . it’s infuriating.

I have WinXP Pro 2002 SP 3 running on a 1.8 GHz dual-core Pentium, 1GB RAM, 240 GB HDD space. I also have WinXP HE SP3 in a different partition. (where this problem doen’t occur.)

FF worked fine for a few days after re-installing windows, then began this “feature.”

I have disabled all plug-ins. I have UNINSTALLED all extensions. Default is the only theme installed.

I have even removed DivX and Real Player 10, as these were the last software I loaded after my disk crash.

AND I have uninstalled FF, then reinstalled it, importing my old (working) profile (prob. didn’t go away). Then I cleanly reinstalled (after uninstalling ALL extensions, disabling all plug-ins). And FFFF versions 3.6.2, 3.6.4 and 3.6.6 all exhibit the same behavior: filename.jpg.jpeg.

AND it happens in SeaMonkey 1.1.7, which I just installed to test!

But it DOESN’T HAPPEN in Win XP HE or Opera. When I run the old 3.6.2 from this partition, I get the problem, wo the problem must exist somewhere n my current system. But where?

I’ve also run Aargente Regestry Cleaner several times (after each SW reload) and CCleaner to remove unwanted files.

My anti-virus AVG is up to date. I ran a full system scan just this morning with no problems detected.

I tried not renaming, but actually deleting the npxxxxx.dll files in the FF plug-ins directory and other application directories. Still, the plug-ins show up as being installed... The business about renaming the dlls in your help file is bunk On next run, FF showed the RENAMED dll as the plugin!

I’m running out of ideas, fellas.

Is the only recourse to run a global file-rename application periodically?

I had the same darn problem, and all the advice I got led me nowhere.

I got tired or renaming files (filename.jpg.jpeg --> filename.jpg) on my hdd, even though I had written some dos batch files to accomplish it.

I tried this today, and it worked: (!)

1.) point Firefox to about:config

2) find the entry for dwhelper.medialink-extensions

3.) double-click the entry, then edit (remove) “|jpeg” from the list. Remove one of the “|” also, so you don’ t end up with “||” in the list.

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I also deleted “jpeg” from the list of registered file extensions, but I’m not sure that had anything to do with the problem or its solution. (In Win Explorer, with a directory open, click tools > Folder Options, then select the File Types tag. Scroll down to .JPEG and delete it. —Or, from a command prompt, enter “assoc .jpeg=” without the quotes.)

Anyway, after deleting jpeg from the list of registered file extensions, and after editing the line in the about:config file, FF no longer appends .jpeg to .jpg files when right-clicking an image, and selecting save as...

Why this fix should work is a mystery to me. I mean, I uninstalled dwhelper and the problem persisted. (Or when dwhelper is uninstalled, does it leave the dwhelper.medialink-extensions entry in about:config? –who knows?)

Anyway, good luck!

See also "Reset Download Actions": http://kb.mozillazine.org/File_types_and_download_actions