Problem: Addons open a window, but the title bar says at the very beginning "moz-extension://....", there is no title preface. More importantly the window is completely blank; if I right click (but not left click) inside the window, or resize the window, then the content paints.
Here is the bug report:
Mozilla has it marked as "won't fix".
The problem for me is that users don't know they can resize the window or otherwise force it to redraw the contents, so it creates a lot of support problems. I cannot change Firefox code or any addon code.
However, maybe KDE or Xorg or Linux can provide me with a temporary workaround? Does anyone have any suggestions?
I thought I could use a KDE Window Rule (System Settings > Window Management > Window Rules), but I don't have experience using them and I have not been able to come up with the correct rule so far.
I tried matching Window title substring on "moz-extension://" and specifying a size to apply initially. I also tried KDE's "Detect Window Properties" and matched on those provided. Either way, it is not matching the window because there is no effect in changing the window size.