Disabling plugin bar in Firefox 3.6.x for Macintosh

Just yesterday (5/24/12), I am now getting the yellow bar that alerts me on a website that, "some plugins used by this page are out of date" and asks me to update the plugins. My laptop is a PowerPC Powerbook with Firefox 3.6.28. Since it is not an Intel Mac, this is the best version of Firefox I can use along with the plugins for this computer. All plugins that can be updated, have been. Yet this yellow bar persists. So how can it now be disabled? It is very annoying! I saw suggestions for how to do it for Windows, but no instructions for Mac. Any help would be appreciated.

hello, enter "about:config" into the address bar of the browser, confirm the info dialog, then search for the preference named "plugins.hide_infobar_for_outdated_plugin" & double-click it in order to toggle it to "true".
if you want to use an up-to-date browser based on firefox on ppc hardware you can switch to "tenfourfox" - the downside is, it doesn't support plugins at all - [[Firefox no longer works with Mac OS X 10.4 or PowerPC processors]]

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I should also add this info for all to see clear as part of my question (can be seen in More system details too):
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:)

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