Gijs, the dialog content scrollbar seems to appear only after shrinking the browser window a little bit past the bottom edge of the dialog -- roughly an extra amount matching the height of the toolbars. I took a screenshot of the window at a height that just starts showing the scrollbar that doesn't allow scrolling down to the bottom of the dialog content. I pasted in the missing content and a copy of the toolbar area of similar height. Maybe the max height of the dialog needs to be reduced by the toolbar height?
Bug 1706279 Comment 1 Edit History
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Gijs, the dialog content scrollbar seems to appear only after shrinking the browser window a little bit past the bottom edge of the dialog -- roughly an extra amount matching the height of the toolbars. I took a screenshot of the window at a height that just starts showing the scrollbar that doesn't allow scrolling down to the bottom of the dialog content. I pasted in the missing content and a copy of the toolbar area of similar height. Maybe the max height of the dialog needs to be reduced by the toolbar height? You can show the dialog with `Cc["@mozilla.org/browser/browserglue;1"].getService().wrappedJSObject._showUpgradeDialog()`