| | Extension Versioning, Update and Compatibility - MDC |
 | | Firefox allows Extension sites to see what Extension version it is running with, so if you change this and forget to reset it then browse to an Extension site, you may install incompatible Extensions that mess up your browser. |
 | | Mismatch events (A new version of Firefox is installed, and Firefox has to check for updates to determine if newer versions of incompatible Extensions are available). |
 | | Depending on the type of event, Firefox may be interested in seeing the newest version of a given Extension, or only in updating the local datasource with more up to date min/maxVersion info. |
| www.mozilla.org /projects/firefox/extensions/update.html (1560 words) |