[Bug 1772473] [NEW] Snap Firefox. Add dictionary is no possible

[Pavol]

Public bug reported:

I replaced all settings from Firefox .DEB to Firefox Snap.
But on Firefox Snap, installed from Ubuntu Software Snap store, I have issues.
Add Slovak language dictionary is no possible
https://addons.mozilla.org/en-US/firefox/language-tools/

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: firefox (not installed)
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon May 21 20:25:02 2018
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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Title:
  Snap Firefox. Add dictionary is no possible

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