I noticed 2 bugs.
The first occurs when you close a webpanel, if you do the reader mode panel is opened and visible. The bug is present in the latest 2 snapshots.
The second one is a bit trickier. If you set separate width for a webpanel and then open up another panel and change the width on it, the width of the webpanel will be changed too -- despite it having separate width ticked.
Can anyone confirm these, or tell me if they have been reported already? -- osx 10.11.6 / vivaldi 1.11.915.3
Both bugs still persist in 1.11. Obviously the reader panel isn't being shown in the first case, instead a white space appears.
I have reported them as VB-30886 and VB-30884.