I just looked the attached test extension and I noticed that it does embed a variables view in the sidebar (and not an extension page as I assumed in Comment 4). The shared container for all the devtools inspector sidebar types that an extension can register is defined by `devtools/client/inspector/extensions/components/ExtensionSidebar.js` and the class name of that container element is "extension-sidebar" (and it also have the class name "inspector-tabpanel"): https://searchfox.org/mozilla-central/rev/e3fc8f8970491aef14d3212b2d052942f4d29818/devtools/client/inspector/extensions/components/ExtensionSidebar.js#86 (and [this component also have a style property set from the React render method](https://searchfox.org/mozilla-central/rev/e3fc8f8970491aef14d3212b2d052942f4d29818/devtools/client/inspector/extensions/components/ExtensionSidebar.js#92-94)).
Bug 1582866 Comment 5 Edit History
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I just looked the attached test extension and I noticed that it does embed a variables view in the sidebar (and not an extension page as I assumed in Comment 4). The shared container for all the devtools inspector sidebar types that an extension can register is defined by `devtools/client/inspector/extensions/components/ExtensionSidebar.js` and the class name of that container element is "extension-sidebar" (and it also have the class name "inspector-tabpanel"): https://searchfox.org/mozilla-central/rev/e3fc8f8970491aef14d3212b2d052942f4d29818/devtools/client/inspector/extensions/components/ExtensionSidebar.js#86 This component has also a `style` property set from the React render method](https://searchfox.org/mozilla-central/rev/e3fc8f8970491aef14d3212b2d052942f4d29818/devtools/client/inspector/extensions/components/ExtensionSidebar.js#92-94)), and so the following diff should be one way to apply on this frame the css styling fixes mentioned in comment 0: ``` diff --git a/devtools/client/inspector/extensions/components/ExtensionSidebar.js b/devtools/client/inspector/extensions/components/ExtensionSidebar.js --- a/devtools/client/inspector/extensions/components/ExtensionSidebar.js +++ b/devtools/client/inspector/extensions/components/ExtensionSidebar.js @@ -91,6 +91,7 @@ class ExtensionSidebar extends PureCompo className, style: { height: "100%", + overflow: "auto", }, }, sidebarContentEl ```