/usr/share/xul-ext/greasemonkey/modules/ is in xul-ext-greasemonkey 1.15-1~deb7u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/xul-ext/greasemonkey/modules/GM_notification.js
/usr/share/xul-ext/greasemonkey/modules/GM_setClipboard.js
/usr/share/xul-ext/greasemonkey/modules/addons4.js
/usr/share/xul-ext/greasemonkey/modules/constants.js
/usr/share/xul-ext/greasemonkey/modules/miscapis.js
/usr/share/xul-ext/greasemonkey/modules/parseScript.js
/usr/share/xul-ext/greasemonkey/modules/prefmanager.js
/usr/share/xul-ext/greasemonkey/modules/remoteScript.js
/usr/share/xul-ext/greasemonkey/modules/script.js
/usr/share/xul-ext/greasemonkey/modules/scriptDependency.js
/usr/share/xul-ext/greasemonkey/modules/scriptIcon.js
/usr/share/xul-ext/greasemonkey/modules/scriptRequire.js
/usr/share/xul-ext/greasemonkey/modules/scriptResource.js
/usr/share/xul-ext/greasemonkey/modules/stats.js
/usr/share/xul-ext/greasemonkey/modules/sync.js
/usr/share/xul-ext/greasemonkey/modules/third-party/
/usr/share/xul-ext/greasemonkey/modules/third-party/MatchPattern.js
/usr/share/xul-ext/greasemonkey/modules/third-party/convert2RegExp.js
/usr/share/xul-ext/greasemonkey/modules/third-party/droppedUrls.js
/usr/share/xul-ext/greasemonkey/modules/third-party/getChromeWinForContentWin.js
/usr/share/xul-ext/greasemonkey/modules/util/
/usr/share/xul-ext/greasemonkey/modules/util.js
/usr/share/xul-ext/greasemonkey/modules/util/alert.js
/usr/share/xul-ext/greasemonkey/modules/util/anonWrap.js
/usr/share/xul-ext/greasemonkey/modules/util/apiLeakCheck.js
/usr/share/xul-ext/greasemonkey/modules/util/checkCoralCache.js
/usr/share/xul-ext/greasemonkey/modules/util/compareFirefoxVersion.js
/usr/share/xul-ext/greasemonkey/modules/util/emptyEl.js
/usr/share/xul-ext/greasemonkey/modules/util/enqueueRemoveFile.js
/usr/share/xul-ext/greasemonkey/modules/util/getBinaryContents.js
/usr/share/xul-ext/greasemonkey/modules/util/getBrowserWindow.js
/usr/share/xul-ext/greasemonkey/modules/util/getContents.js
/usr/share/xul-ext/greasemonkey/modules/util/getEditor.js
/usr/share/xul-ext/greasemonkey/modules/util/getEnabled.js
/usr/share/xul-ext/greasemonkey/modules/util/getScriptSource.js
/usr/share/xul-ext/greasemonkey/modules/util/getService.js
/usr/share/xul-ext/greasemonkey/modules/util/getTempDir.js
/usr/share/xul-ext/greasemonkey/modules/util/getTempFile.js
/usr/share/xul-ext/greasemonkey/modules/util/getUriFromFile.js
/usr/share/xul-ext/greasemonkey/modules/util/hitch.js
/usr/share/xul-ext/greasemonkey/modules/util/inArray.js
/usr/share/xul-ext/greasemonkey/modules/util/installScriptFromSource.js
/usr/share/xul-ext/greasemonkey/modules/util/isGreasemonkeyable.js
/usr/share/xul-ext/greasemonkey/modules/util/logError.js
/usr/share/xul-ext/greasemonkey/modules/util/memoize.js
/usr/share/xul-ext/greasemonkey/modules/util/newUserScript.js
/usr/share/xul-ext/greasemonkey/modules/util/openInEditor.js
/usr/share/xul-ext/greasemonkey/modules/util/scriptDir.js
/usr/share/xul-ext/greasemonkey/modules/util/scriptMatchesUrlAndRuns.js
/usr/share/xul-ext/greasemonkey/modules/util/setEditor.js
/usr/share/xul-ext/greasemonkey/modules/util/setEnabled.js
/usr/share/xul-ext/greasemonkey/modules/util/sha1.js
/usr/share/xul-ext/greasemonkey/modules/util/showInstallDialog.js
/usr/share/xul-ext/greasemonkey/modules/util/sniffGrants.js
/usr/share/xul-ext/greasemonkey/modules/util/timeout.js
/usr/share/xul-ext/greasemonkey/modules/util/uriFromUrl.js
/usr/share/xul-ext/greasemonkey/modules/util/uuid.js
/usr/share/xul-ext/greasemonkey/modules/util/windowId.js
/usr/share/xul-ext/greasemonkey/modules/util/windowIdForEvent.js
/usr/share/xul-ext/greasemonkey/modules/util/windowIsClosed.js
/usr/share/xul-ext/greasemonkey/modules/util/writeToFile.js
/usr/share/xul-ext/greasemonkey/modules/xmlhttprequester.js