Dragging the window via the "header bar" with a digitiser pen under Wayland results in the window "wobbling" around under the pen tip as it's being dragged - sometimes by small amounts, sometimes by distances about the height of the "header bar", in all directions. This doesn't happen with mouse dragging, nor under X (touch dragging doesn't work at all - separate bug filed). It also doesn't happen with any other Wayland or XWayland windows.
Can you please check Firefox 60 Beta [1]? That's target release for this feature, Fedora has only a tech preview in Firefox 59. [1] https://www.mozilla.org/en-US/firefox/channel/desktop/
Still wobbly on FF60 final.
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Fedora 28 changed to end-of-life (EOL) status on 2019-05-28. Fedora 28 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.