主要是修好几个bugs
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Fix JavaScript error ("TypeError: data is null in PrivacyFilter.jsm") in
console which may significantly degrade sessionstore reliability and
performance (bug 1553413)
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Proxy authentication dialog box repeatedly pops up asking to authenticate
after upgrading to Firefox 67 (bug 1548804)
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Pearson MyCloud breaks if FIDO U2F is not Chrome's implementation (bug
1551282)
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Starting in safe mode on Linux or macOS causes Firefox to think on the
subsequent launch that the profile is too recent to be used with this version
of Firefox (bug 1556612)
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Linux distribution users can't easily install/use additional/different
languages using the built-in preferences UI (bug 1554744)
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Developer tools users can't copy the href/src content from various HTML tags
via the context menu in the Inspector markup view (bug 1552275)
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Custom home page is broken with clearing data on shutdown settings applied
(bug 1554167)
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Performance-regression for eclipse RAP based applications (bug 1555962)
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macOS 10.15 crash fix (bug 1556076)
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Can't start two downloads in parallel via <a download> anymore (bug 1542912)