mozilla.org_firefox_releases_1.5.0.6
This appears to be a structured string, possibly a file name or identifier. A direct translation or representation in English would keep the same format as it already uses English characters and follows a conventional naming scheme. If this refers to a specific release of Firefox by Mozilla, the English representation remains:
**mozilla.org Firefox releases 1.5.0.6**
If you need it in a sentence format, it could be:
**The Firefox release 1.5.0.6 from mozilla.org.**