Just found a quick workaround:
1) Download AutoAuth Plugin (mentioned earlier in the comments)
V2.1 ->
https://addons.mozilla.org/mobile/downloads/file/108175/type:attachment/autoauth-2.1-fx+fn.xpi?src=version-history
2) Open the .xpi with 7zip (or similar) and edit the install.rdf
add ->
<!-- Thunderbird -->
<em:targetApplication>
<Description>
<em:id>{3550f703-e582-4d05-9a08-453d09bdfdc6}</em:id>
<em:minVersion>2.0</em:minVersion>
<em:maxVersion>3.1.*</em:maxVersion>
</Description>
</em:targetApplication>
3) Install in TB 3.1
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https://bugs.launchpad.net/bugs/222208
Title:
user-id and password not sent automatically for rss-feed
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