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Links in Thunderbird do not open browser
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The default apparmor configuration shipped with PureOS does not allow links in Thunderbird to be opened in PureBrowser.

To fix, add this line to /etc/apparmor.d/local/usr.bin.thunderbird :

/usr/lib/purebrowser/purebrowser mixr,
(note; the trailing comma is required)

Then “sudo apparmor_parser -r /etc/apparmor.d/usr.bin.thunderbird”

PureOS should enable this by default in /etc/apparmor.d/usr.bin.thunderbird, as it is expected behavior and both Thunderbird and PureOS are pre-installed.

Event Timeline

This worked for me as a temporary solution (sorry I am a Linux noob and I dont know if it might be the same solution you provided and just done in an other way?)

sudo apt install apparmor-utils

then after it was installed sucessfully, I typed:

sudo aa-logprof

it willl show the following:

Reading log entries from /var/log/syslog.
Updating AppArmor profiles in /etc/apparmor.d.

Profile:  thunderbird
Execute:  /usr/lib/purebrowser/purebrowser
Severity: unknown

(I)nherit / (C)hild / (P)rofile / (N)amed / (U)nconfined / (X) ix On / (D)eny / Abo(r)t / (F)inish

Should AppArmor sanitise the environment when
switching profiles?

Sanitising environment is more secure,
but some applications depend on the presence

[(Y)es] / (N)o

I typed : Y
Then: S
Then: F

Now Thunderbird can open attachment again in the default application and I can also click on URLs and they will open in PureBrowser.

Thanks to Jens Erat at

Greetings from a happy Librem 15 user in Switzerland

jonas.smedegaard renamed this task from Links in Thuderbird do not open browser to Links in Thunderbird do not open browser.Oct 11 2018, 08:48