One to four dot-separated integers identifying the version of this extension. A couple of rules apply to the integers: they must be between 0 and 65535, inclusive, and non-zero integers can't start with 0. For example, 99999 and 032 are both invalid.
Here are some examples of valid versions:
"version": "1" "version": "1.0" "version": "2.10.2" "version": "3.1.2.4567" The autoupdate system compares versions to determine whether an installed extension needs to be updated. If the published extension has a newer version string than the installed extension, then the extension is automatically updated.
The comparison starts with the leftmost integers. If those integers are equal, the integers to the right are compared, and so on. For example, 1.2.0 is a newer version than 1.1.9.9999.
A missing integer is equal to zero. For example, 1.1.9.9999 is newer than 1.1.
For more information, see Autoupdating.