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# accessibility.browsewithcaret
最近浏览 Firefox 时，发现页面上总是有一个光标，在页面上，导致无法使用方向键控制
滚屏。
查询发现时 Firefox 的一个配置被打开了名为 `accessibility.browsewithcaret`
[链接](http://kb.mozillazine.org/Accessibility.browsewithcaret)
> ### Background
> Originally for debugging purposes, this preference now determines whether or
> not Caret Browsing mode is active. Caret Browsing is provided as a way to
> navigate through a web page—using only the keyboard—by moving a text caret.
> This mode is more easily toggled by pressing [F7].
> Caret Browsing mode changes the effects of the arrow keys, as well as the
> [Home] and [End] keys.
> ### Possible values and their effects
> - True
> A blinking cursor (the caret) is visible on all displayed webpages, allowing
> the user to navigate through the page as they might a word processor document.
> - False
> The system caret is hidden. (Default)
> ### UI
> **Firefox**
> Tools → Options → Advanced → General / Accessibility → "Always use the cursor
> keys to navigate within pages" (Firefox 2 and above) Tools → Options →
> Advanced → General / Accessibility → "Allow text to be selected with the
> keyboard" (Firefox 1.5)