Additionally I don't think we should ever use prefixes like EXT (as in WEBGL_EXT_lose_context) for unratified extensions. EXT, ARB, OES, etc. should only ever be used to mimic the names of the corresponding Khronos extension.
I don't understand your objection to using EXT as a "prefix". EXT
extensions are not Khonos ratified. It seems to me just as
legitimate to use WEBGL_EXT for a WEBGL specific extension as for
the WEBGL version of an existing EXT extension found in the Khronos
registry. There should be no additional confusion caused. Both are
unratified extensions whose spec's cannot be relied on as final.