To guarantee a consistent and cohesive user experience, Firefox's layout generally follows modern web browser layout patterns. Firefox also adapts to each operating system, inheriting some of their UI and layout patterns as well.
Anatomy
The desktop browser layout is broken up into a few areas.
The UI that frames the web content is "the chrome" (tab strip, toolbar, bookmarks, infobar, sidebar, find bar, etc.); Anything found within the web content (viewport) is referred to as "in-content."; And lastly, the line separating these is called the "Line of Trust".
Firefox for macOS
|
Key |
Description |
|
|---|---|---|
|
1 |
The chrome |
The collective term for the UI elements that frame web content, including toolbars, sidebars, and the tab strip. |
|
2 |
In-content |
The area of the browser where web content appears. |
|
3 |
Line of Trust |
The line separating the chrome from in-content material, which helps identify trustworthy content that comes from the browser (web content cannot cross into the chrome). See Line of Trust |