We used to rely on an iframe element which has a min-height coming from global.css:
```css
xul|iframe {
border: none;
width: 100px;
height: 100px;
min-width: 10px;
min-height: 10px;
}
```
https://searchfox.org/mozilla-central/rev/8b7aa8af652f87d39349067a5bc9c0256bf6dedc/toolkit/themes/osx/global/global.css#67-71
We now use a browser element, so we need to set a min height "manually".
Bug 1594359 Comment 3 Edit History
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We used to rely on an `<iframe>` element which has a min-height coming from global.css:
```css
xul|iframe {
border: none;
width: 100px;
height: 100px;
min-width: 10px;
min-height: 10px;
}
```
https://searchfox.org/mozilla-central/rev/8b7aa8af652f87d39349067a5bc9c0256bf6dedc/toolkit/themes/osx/global/global.css#67-71
We now use a `<browser>` element, so we need to set a min height "manually".