How-To: FireFox calls SecondLife SLURLs
To configure Firefox to handle the secondlife:// protocol, you'll need to go into Firefox's configuration settings. Do the following:
1. In a blank tab, type about:config. You will be shown a page with a list of Firefox's configuration variables.
2. In the filter field, type network.protocol-handler. This will show a list of protocols handled by Firefox. You may or may not see the secondlife protocol in the list. If it's there, it would look something like network.protocol-handler.external.secondlife. The protocol is probably not there, though, in which case you'll need to add it.
3. To create the configuration setting, right-click on any item in the list and select New > Boolean. In the preference name, type network.protocol-handler.external.secondlife, and set the value to true. This tells Firefox to use an external program to handle the secondlife:// protocol.
4. Next, create a new string item by right-clicking anywhere on the list and selecting New > String. In the preference name, type network.protocol-handler.app.secondlife, and in the value field, type the path to the program you want to use for that protocol (e.g. /home/mark/SecondLife_i686_1_18_3_5_RELEASECANDIDATE/secondlife).
n.b., I am waiting for the SecondLife Linux programmers to tie the Release Candidate updater to the downloader, so that I don't have the problem of not being able to update the Release automatically.
5. Restart Firefox and you should be set. If not, reboot and try it again. I had to reboot.
6. Try SLurl: Location-Based Linking in Second Life Firefox should put a menu on the screen asking you if you want to run Second Life. Select Launch Application, if it works by running your SecondLife program, the next time you try it, you can check the "Remember my choice for all links of this type" button.
Explains how to edit about:config
About:config - MozillaZine Knowledge Base
Explains SLURL and about:config
Technopaideia: Firefox and SLURLs and Troubleshooting
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Basecamp Forum / How to configure Firefox to handle webcal:// ?