I'm running into a (related?) similar issue, which I'll document on this bug too, though it might be unrelated. Note restarting firefox and restarting my OS had no effect. STR: 1. Launch https://www.mozilla.org/media/contentcards/img/home-2019/card_2/guide-high-res.a12bff1c92ab.jpg 2. Open browser toolbox with CMD + Option + Shift + I Expected: Browser toolbox launches, attached to the current active window Actual: See screenshot browser_toolbox_split.png [Window titled "Multiprocess Browser Toolbox". The left half of the window is white, with JSON text titled "Browser Toolbox connection status". The JSON below the heading indicates the connection is successful. The right half of the window shows the normal browser toolbox. The left "pane" is not collapsible and does not vanish with use of the toolbox.]
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I'm running into a (related?) similar issue, which I'll document on this bug too, though it might be unrelated. Note restarting firefox and restarting my OS had no effect. STR: 1. Launch https://www.mozilla.org/media/contentcards/img/home-2019/card_2/guide-high-res.a12bff1c92ab.jpg 2. Open browser toolbox with CMD + Option + Shift + I Expected: Browser toolbox launches, attached to the current active window Actual: See screenshot browser_toolbox_split.png [Window titled "Multiprocess Browser Toolbox". The left half of the window is white, with JSON text titled "Browser Toolbox connection status". The JSON below the heading indicates the connection is successful. The right half of the window shows the normal browser toolbox. The left "pane" is not collapsible and does not vanish with use of the toolbox.] My current nightly is from here: https://hg.mozilla.org/mozilla-central/rev/2f6870dd1b99edaba1de4d2aa97f3910a640c5bf I'm running OSX 10.15.3
I'm running into a (related?) similar issue, which I'll document on this bug too, though it might be unrelated. Note restarting firefox and restarting my OS had no effect. STR: 1. Launch https://www.mozilla.org/media/contentcards/img/home-2019/card_2/guide-high-res.a12bff1c92ab.jpg 2. Open browser toolbox with CMD + Option + Shift + I Expected: Browser toolbox launches, attached to the current active window Actual: See screenshot browser_toolbox_split.png [Window titled "Multiprocess Browser Toolbox". The left half of the window is white, with JSON text titled "Browser Toolbox connection status". The JSON below the heading indicates the connection is successful. The right half of the window shows the normal browser toolbox. The left "pane" is not collapsible and does not vanish with use of the toolbox.] My current nightly is from here: https://hg.mozilla.org/mozilla-central/rev/2f6870dd1b99edaba1de4d2aa97f3910a640c5bf I'm running OSX 10.15.3 I also initially thought this might be a fission thing, but I disabled fission.autostart and got the same results.