Those files are being created by the new sqlite:

• See: http://forums.mozillazine.org/viewtopic.php?p=11063987&sid=f0142978840518cd9fa0905e5eb78e03#p11063987

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Not related to your question, but...

You need to update some plug-ins:

• Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/
• Shockwave Flash (Adobe Flash or Flash): Updating Flash in Firefox

Thanks for the info. I guess I had better check for a newer Flash plugin. The linked page from your reference explained somewhat. What processes are sharing data? The -shm implies that data in memory is being shared between processes.

The link says:

• Shm files are Shared Memory files and seem to be used with the above. (the above is "Wal files http://www.sqlite.org/wal.html "Write-Ahead Logging"")

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So the -shm file is created as a hex dump of the index in memory in case Firefox is aborted abnormally, so that it can pick up where it left off?

I did not read the entire article. You can explore some of the documentation at the following if you need a thorough understanding:

• wal: http://www.sqlite.org/search?q=wal
• shm: http://www.sqlite.org/search?q=shm

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Thanks. Interesting pages.