pkg crash and strange depends

[Slawa Olhovchenkov]

I am try to install firefox from private repo:

# pkg install firefox
Updating ivs repository catalogue...
ivs repository is up to date.
All repositories are up to date.
The following 2 package(s) will be affected (of 0 checked):

New packages to be INSTALLED:
        firefox: 55.0.3_1,1 [ivs]
        nvidia-driver: 390.25 [ivs]

Number of packages to be installed: 2

The process will require 300 MiB more space.
32 MiB to be downloaded.

Proceed with this action? [y/N]: y
[1/1] Fetching firefox-55.0.3_1,1.txz: 100%   32 MiB   2.2MB/s    00:15    
Checking integrity...Child process pid=8484 terminated abnormally: Segmentation fault

1. WTF? firefox dpends on nvidia-driver?
2. Segmentation fault?

What information need to debug and resolve this?