I use 2.49.5 64-bit from https://www.wg9s.com/comm-esr/ and have no problems.
general.useragent.override;Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:67.0)
Gecko/20100101 Firefox/67.0
general.useragent.override.instagram.com;Mozilla/5.0 (Windows NT 6.1; Win64;
x64; rv:52.0) Gecko/20100101 SeaMonkey/2.49.5
general.useragent.override.netflix.com;Mozilla/5.0 (Windows NT 6.1; Win64;
rv:52.0) Gecko/20100101 Firefox/52.0
general.useragent.override.youtube.com;Mozilla/5.0 (Windows NT 6.1; Win64; x64;
rv:52.0) Gecko/20100101 SeaMonkey/2.49.5
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