Firefox loses macbook.local connection

I have been using MAMP on my MacBook for the last couple of years.
I'm currently running OS X Leopard 10.5.8 and Firefox 9.0.1 and recently, when using MAMP as a local server, Firefox loses connection to the address http://firstname-surname-macbook.local/ but still connects to http://localhost/. It has worked fine with both local URLs in the past.
I was wondering whether this could be an Apple problem or more likely a Firefox problem? Any help is appreciated.

Hello Miguel.
You may be having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not coming from one of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] and select ''Disable all add-ons''. If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and theme. You can troubleshoot plugins the same way.
If you want support for one of your add-ons, you'll need to contact its author.

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