1959834 - Tab hover preview error in the console, STR unknown

Status: RESOLVED DUPLICATE of bug 1921329

(Firefox :: Tabbed Browser, defect)

Description

[Itiel]

Filing this just in case the stacktrace helps without an STR (I have no idea what I did to make this error be logged):

TypeError: can't access property "clientHeight", body is null
    receiveMessage resource://gre/actors/ThumbnailsChild.sys.mjs:29
    JSActor query*captureTabPreviewThumbnail resource://gre/modules/PageThumbs.sys.mjs:495
    _maybeRequestThumbnail chrome://browser/content/tabbrowser/tab-hover-preview.mjs:151
    activate chrome://browser/content/tabbrowser/tab-hover-preview.mjs:188
    on_TabHoverStart chrome://browser/content/tabbrowser/tabs.js:283
    handleEvent chrome://browser/content/tabbrowser/tabs.js:3022
    _mouseenter chrome://browser/content/tabbrowser/tab.js:618
    on_mouseover chrome://browser/content/tabbrowser/tab.js:405
    handleEvent chrome://global/content/customElements.js:459
    MozTabbrowserTab chrome://browser/content/tabbrowser/tab.js:44
    _createTab chrome://browser/content/tabbrowser/tabbrowser.js:3242
    addTab chrome://browser/content/tabbrowser/tabbrowser.js:2724
    openLinkIn resource:///modules/URILoadingHelper.sys.mjs:573
    openLinkIn chrome://browser/content/utilityOverlay.js:119
    contentAreaClick resource:///actors/ClickHandlerParent.sys.mjs:144
    receiveMessage resource:///actors/ClickHandlerParent.sys.mjs:60
tab-hover-preview.mjs:164:17

Comment 1

[Marco Bonardo [:mak]]

This is very similar to https://bugzilla.mozilla.org/show_bug.cgi?id=1921329#c6 so it's likely the same bug, and that bug contains some steps to reproduce. Maybe you could try checking with them.