Update to 2.49.1
Based on the Firefox/Thunderbird ESR (extension support release) code version 52.4.0
Fixes various security issues, see https://www.mozilla.org/en-US/security/known-vulnerabilities/firefox-esr/ and https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/ for more info.
Since the version of 2.48, SeaMonkey uses another disk cache implementation. It is preferable to clear the cache (even before the update) to avoid extra disk space usage by the old cache data.
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