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# Firefox {#sec-firefox}
## Build wrapped Firefox with extensions and policies
The `wrapFirefox` function allows to pass policies, preferences and extension that are available to firefox. With the help of `fetchFirefoxAddon` this allows build a firefox version that already comes with addons pre-installed:
```nix
{
myFirefox = wrapFirefox firefox-unwrapped {
nixExtensions = [
(fetchFirefoxAddon {
name = "ublock"; # Has to be unique!
url = "https://addons.mozilla.org/firefox/downloads/file/3679754/ublock_origin-1.31.0-an+fx.xpi";
sha256 = "1h768ljlh3pi23l27qp961v1hd0nbj2vasgy11bmcrlqp40zgvnr";
})
];
extraPolicies = {
CaptivePortal = false;
DisableFirefoxStudies = true;
DisablePocket = true;
DisableTelemetry = true;
DisableFirefoxAccounts = true;
FirefoxHome = {
Pocket = false;
Snippets = false;
};
UserMessaging = {
ExtensionRecommendations = false;
SkipOnboarding = true;
};
};
extraPrefs = ''
// Show more ssl cert infos
lockPref("security.identityblock.show_extended_validation", true);
'';
};
}
```
If `nixExtensions != null` then all manually installed addons will be uninstalled from your browser profile.
To view available enterprise policies visit [enterprise policies](https://github.com/mozilla/policy-templates#enterprisepoliciesenabled)
or type into the Firefox url bar: `about:policies#documentation`.
Nix installed addons do not have a valid signature, which is why signature verification is disabled. This does not compromise security because downloaded addons are checksumed and manual addons can't be installed. Also make sure that the `name` field of fetchFirefoxAddon is unique. If you remove an addon from the nixExtensions array, rebuild and start Firefox the removed addon will be completly removed with all of its settings.
## Troubleshooting {#sec-firefox-troubleshooting}
If addons do not appear installed although they have been defined in your nix configuration file reset the local addon state of your Firefox profile by clicking `help -> restart with addons disabled -> restart -> refresh firefox`. This can happen if you switch from manual addon mode to nix addon mode and then back to manual mode and then again to nix addon mode.
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