This update to Mozilla Thunderbird 45.7.0 fixes security issues and bugs.

The following security issues from advisory MFSA 2017-03 were fixed (boo#1021991)
In general, these flaws cannot be exploited through email in
Thunderbird because scripting is disabled when reading mail,
but are potentially risks in browser or browser-like contexts:

- CVE-2017-5375: Excessive JIT code allocation allows bypass of ASLR and DEP (boo#1021814)
- CVE-2017-5376: Use-after-free in XSL (boo#1021817)
- CVE-2017-5378: Pointer and frame data leakage of Javascript objects (boo#1021818)
- CVE-2017-5380: Potential use-after-free during DOM manipulations (boo#1021819)
- CVE-2017-5390: Insecure communication methods in Developer Tools JSON viewer (boo#1021820)
- CVE-2017-5396: Use-after-free with Media Decoder (boo#1021821)
- CVE-2017-5383: Location bar spoofing with unicode characters (boo#1021822)
- CVE-2017-5373: Memory safety bugs fixed in Thunderbird 45.7 (boo#1021824)

The following non-security bugs were fixed:

- Message preview pane non-functional after IMAP folder was renamed or moved
- "Move To" button on "Search Messages" panel not working
- Message sent to "undisclosed recipients" shows no recipient
(non-functional since Thunderbird version 38)