Can't change theme via firefox

Hello folks:

Using:
LibreOffice Version: 6.0.5.2
Build ID: 00m0(Build:2)
CPU threads: 4; OS: Linux 4.12; UI render: default; VCL: kde4;
Locale: en-US (en_US.UTF-8); Calc: group

With instructions from:
https://help.libreoffice.org/Common/Personalization
Tools - Options - LibreOffice - Personalization

[Quote:]

Own theme
Choose this option to open the “Select Firefox Theme” dialog and pick your own.

Select Firefox Theme dialog
This dialog allows you to install a specific theme or gives you a glimpse on other exciting themes from the Mozilla Firefox themes website.

Custom Search
Type or paste the URL of the theme’s webpage. To get the URL, navigate with your browser to the theme’s webpage and copy the URL displayed in the navigation bar of your browser. Then paste it in the dialog’s text box. Click the Search button to download and install it in LibreOffice.

[Unquote]

BUT…

When I put a url

into the dialog and click “Go”, it only does this:

[Quote:]

Error:
Cannot open Teal Blue by MaDonna – Get this Theme for 🦊 Firefox (en-US), please try again later.

[Unquote]

This is all it ever does, and doesn’t seem to matter what URL is in the dialog.

What am I missing?

openSUSE-LEAP 15.0 KDE-x86_64 |
Gigabyte GA-F2A88X-D3HP (rev. 1.0) | 16GB DDR3-1866
AMD 880G + SB850 Chipset | ATI Radeon HD 4250 (DirectX10.1)
sda=80GB Ext4 | sdb&sdc=500GB Ext4 | sdd=1T Ext4 | Firefox 60.0.2 | Thunderbird 52.8.0

This is probably a bug.

There are several bugs in this area, for example https://bugs.documentfoundation.org/show_bug.cgi?id=118881.
Comment 8 on that bug gives my documentation for installing an off-line theme on your system, if the theme has already been downloaded, or created by yourselves.

There have been a number of changes in LibO support of Themes or Personas as Firefox have changed the method of support. See the question “Online theme error” for example.

The support has been rewritten in LibO 6.2.

See release note 6.3