Comment # 21 on bug 1221531 from Paul Tannington

I came across this issue on a TW and Leap 15.5 system earlier today.

I'm not convinced that mozilla-nss is the whole cause of this issue.

I also had a leap 15.5 system which was fully updated yesterday, that brought
mozilla-nss and associated packages to V3.98 - That system was updated and then
switched off, so I had not used firefox since the update.

On that system I downgraded mozilla-nss, mozilla-nss-certs, libsoftokn3 and
libfreebl3 to 3.97

Currently installed:

paul@HP255G7:~> zypper se -i -sx -t  package MozillaFirefox mozilla-nss
mozilla-nss-certs libsoftokn3 libfreebl3
Loading repository data...
Reading installed packages...

S  | Name              | Type    | Version           | Arch   | Repository
---+-------------------+---------+-------------------+--------+---------------
i+ | libfreebl3        | package | 3.97-lp155.2.1    | x86_64 | Mozilla (Leap)
i+ | libsoftokn3       | package | 3.97-lp155.2.1    | x86_64 | Mozilla (Leap)
i+ | mozilla-nss       | package | 3.97-lp155.2.1    | x86_64 | Mozilla (Leap)
i+ | mozilla-nss-certs | package | 3.97-lp155.2.1    | x86_64 | Mozilla (Leap)
i+ | MozillaFirefox    | package | 123.0.1-lp155.1.1 | x86_64 | Mozilla (Leap)
paul@HP255G7:~>

Upon starting firefox, after approximatey 60secs a banner displayed notifying
addons had been disabled.

I had a backup of the profile for FF 123.0.0 which I restored, again upon
starting FF the addons where disabled.

With a completely new FF profile I'm unable to add addons, tested with
"FlagFox" and "NoScript"

Both attempts fail with the message:

"Installation aborted because the add-on appears to be corrupt."