a certain large search company said to only hire smart people also relies on MySQL for its critical infrastructure.
It seems to be working pretty well for them, don't you think?
It's not that they're "outdated" exactly. The problem is that each addon has a file called install.rdf, which is an XML file where you define properties of the addon, like the addon's name, version #, author, type, etc. It has this section:
<em:targetApplication>
<Description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id> <!-- Firefox -->
<em:minVersion>4.0b7</em:minVersion>
<em:maxVersion>6.*</em:maxVersion>
</Description>
</em:targetApplication>
When you try to install an addon, it looks at the minVersion and maxVersion and if your FF version is outside of that it won't let you install it.
Therefore, whenever a new version of FF comes out, each addon developer has to update their install.rdf file and upload a new version. It's kind of a hassle for those of us who have made FF addons, especially with the new development cycle.
However, there is this page that's constantly updated and lists the valid version numbers. You can set your addon's maxVersion as far out as 7.0a1 right now, so in theory you wouldn't have to update it until 7.0a1 comes out.
Promising costs nothing, it's the delivering that kills you.