Thunderbird 64-bit - version 68.7.0 is released
2020-04-08   link

Firefox 64-bit - version 75.0 is released
2020-04-06   link

Firefox 64-bit - version 74.0.1 is released
2020-04-03   link

Firefox 64-bit - version 74.0 is released
2020-03-09   link

Firefox 64-bit - version 73.0.1 is released
2020-02-18   link

Thunderbird 64-bit - version 68.5.0 is released
2020-02-11   link