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Doc: Restrictions - XUL sideeffect by @MrOtherGuy

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https://www.reddit.com/r/FirefoxCSS/comments/u1mdld/comment/i4eg29n/?utm_source=share&utm_medium=web2x&context=3
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alstjr7375 2022-04-12 17:01:59 +09:00
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@ -51,6 +51,14 @@ This project is using SCSS to make a [reusable compatible mixins](../src/utils).
### Side Effect
Only CSS modifications can cause bugs that are hard to think of in the general web, such as the [context menu not appearing](https://github.com/black7375/Firefox-UI-Fix/issues/114).
Especially be careful when customizing XUL elements.
The following code will cause extension panels fail to open and trying to open them might even crash Firefox. (@MrOtherGuy reports)
```css
#nav-bar {
display: flex;
}
```
## Internals
### CSS Loading Order
User CSS(`userChrome.css`, `userContent.css`) is usually loaded first.