Avast Firefox add-on crashes Firefox when an email link is followed

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Firefox started crashing a while ago quite frequently (1) when it was not visible and (2) whenever I followed a URL link in an email message (through Thunderbird).  I methodically disabled Firefox add-ons and finally found that the problem went away when I disabled the avast add-on (9.0.2021.112).  Is this a known bug?  Will there be a fix?  Thanks.

[Eddy]

Did you import the avast certificate in Thunderbird?
If not, please do so and see if that solves things.

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Thanks for the suggestion.*  I'm not sure whether the avast certificate has been imported into Thunderbird.  Looking at the Thunderbird Certificate Manager/Authorities, it shows "avast! Mail Scanner Root".  Is this the certificate you're referring to?  If not, where do I look for the correct one?  Also, I looked at Firefox certificates and there is no listing for avast.  Should there be?  Thanks.

*Sorry for the delay (and duplicate postings).  When I tried to post yesterday all I got was a"waiting for...." message at the bottom of the screen, and then ultimately a blank screen.  I wasn't aware the postings went through.

[Eddy]

Don't worry about the double posting.
It happens more lately.

Yes, you got the correct certificate.

I suggest installing avast 2015 RC3 and see if that solves the problem.

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Is Avast 2015 in beta?  I don't see anything about it on the Avast website.  (I have the latest 2014 version, 2014.0.0.2021.)

[Asyn]

-> https://forum.avast.com/index.php?topic=157166.0

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I updated to Avast 2015 and re-enabled the Avast Firefox add-on.  However the first time I followed a link in an email message Firefox crashed.  I've now disabled the add-on once again.

(I *think* I can do without the add-on, since I have the Web Of Trust (WOT) add-on enabled and I *think* it does much the same as what the Avast add-on does.)

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https://forum.avast.com/index.php?topic=157675.0