> Fully up-to-date CentOS 5.2 and Firefox browser. A previous thread had a > problem with plugins disappearing. I've discovered, by accident, a > causal relationship. > > Running a Thunderbird mail client (could happen with others? Haven't > tested with Evolution yet.) I click a link that opens the browser. BANG! > The plugins.dat is "emptied". > > Restored from my rsync backup, repeat, BANG! "Empty" again. > > Now, if the browser is already open, NP. > > Anyone can confirm? > > Known problem? Are you using a 64-bit firefox by chance? I have a similar problem with flash plugin. Try to reload a page or restart the browser. This works for me. I didn't look any further as I thought this to be a problem of 32-bit flash plugin with 64-bit browser. HTH