Andre had a good point regarding the vertical line issue that I should check monitor and graphic card.
So, first I checked it on mobile phone and on my laptop, no issue with the lines.
Then I checked it again on my PC with Microsoft internet browser, no issue.
That means no issue with monitor or graphic card.
So Firefox is causing the issue in combination of the jAlbum viewer, but if I do e.g. 5 reloads of the website then at least one of them is ok with no problems.
This is really strange, but it is now clear a problem of my Firefox.
So the line issue can be closed.
But there is still a problem with the pole picture and may be difficult to fix, looks like the author of the spherical viewer is not improving the viewer.