**Bug 1**: This bug exists in 68, 69 beta, and also Daily. The discovery pane links indeed seem to be broken in 68, 69 beta, and also Daily, and they produce an error in ExtensionsUI.jsm:  This is a Thunderbird bug. Installation works fine in 60. I don't know if fixing it requires a client patch. It may be possible to patch the website, since some URLs work. It's only the URLs on the recommended part of the discovery pane that fail. **Bug Two**: This bug exists in 68, 69 beta, but DOES NOT exist in Daily: The installed Themes tab becomes completely blank(not even showing default themes) after you install a theme until you restart Thunderbird, at which point it fixes itself. Note that this issue extends to add-on installation as well, not just themes... and it leads to a weirdly broken looking extension tab: 
Bug 1572827 Comment 1 Edit History
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**Bug 1**: This bug exists in 68, 69 beta, and also Daily. The discovery pane links indeed seem to be broken in 68, 69 beta, and also Daily, and they produce an error in ExtensionsUI.jsm: https://i.imgur.com/eh4TMxZ.png This is a Thunderbird bug. Installation works fine in 60. I don't know if fixing it requires a client patch. It may be possible to patch the website, since some URLs work. It's only the URLs on the recommended part of the discovery pane that fail. **Bug Two**: This bug exists in 68, 69 beta, but DOES NOT exist in Daily: The installed Themes tab becomes completely blank(not even showing default themes) after you install a theme until you restart Thunderbird, at which point it fixes itself. Note that this issue extends to add-on installation as well, not just themes... and it leads to a weirdly broken looking extension tab: https://i.imgur.com/1WrtQFD.png
**Bug 1**: This bug exists in 68, 69 beta, and also Daily. The discovery pane links indeed seem to be broken in 68, 69 beta, and also Daily, and they produce an error in ExtensionsUI.jsm: https://i.imgur.com/eh4TMxZ.png This is a Thunderbird bug. Installation works fine in 60. I don't know if fixing it requires a client patch. It may be possible to patch the website, since some URLs work. It's only the URLs on the recommended part of the discovery pane that fail. **Bug 2**: This bug exists in 68, 69 beta, but DOES NOT exist in Daily: The installed Themes tab becomes completely blank(not even showing default themes) after you install a theme until you restart Thunderbird, at which point it fixes itself. Note that this issue extends to add-on installation as well, not just themes... and it leads to a weirdly broken looking extension tab: https://i.imgur.com/1WrtQFD.png