gecko-dev/browser/components/urlbar/docs/utilities.rst

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Utilities
=========
Various modules provide shared utilities to the other components:
`UrlbarPrefs.jsm <https://dxr.mozilla.org/mozilla-central/source/browser/components/urlbar/UrlbarPrefs.jsm>`_
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Implements a Map-like storage or urlbar related preferences. The values are kept
up-to-date.
.. highlight:: JavaScript
.. code::
// Always use browser.urlbar. relative branch, except for the preferences in
// PREF_OTHER_DEFAULTS.
UrlbarPrefs.get("delay"); // Gets value of browser.urlbar.delay.
.. note::
Newly added preferences should always be properly documented in UrlbarPrefs.
`UrlbarUtils.jsm <https://dxr.mozilla.org/mozilla-central/source/browser/components/urlbar/UrlbarUtils.jsm>`_
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Includes shared utils and constants shared across all the components.