---
schema_version: "1"
id: 6d3bebe0d2baee6827dd7a7b64d864d6a5b03b8cca0edab8e3e7be882a240c01
title: Considerations for Mozilla Firefox
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/xcloud/264-0-0/getstart_browser_considerations_firefox.md
canonical_url: https://help.salesforce.com/s/articleView?id=xcloud.getstart_browser_considerations_firefox.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 7094197526b4e4257f8cc9bb9b0b5e1579837068e2b5e7c085d42f7c1620fa0e
description: Salesforce makes every effort to test and support the most recent version of Firefox. However, Lightning Experience currently doesn't support Private Browsing.
products:
  - Salesforce Platform
  - Cross Cloud
release: "264"
---
# Considerations for Mozilla Firefox

Salesforce makes every effort to test and support the most recent version of Firefox. However, Lightning Experience currently doesn't support Private Browsing.

Configure advanced preferences to maximize performance in Salesforce Classic.

1. Type about:config in the browser’s location bar, and press Enter.
2. If a warning displays, click **I'll be careful, I promise!**
3. Search for the following preferences and set them to the recommended value by double-clicking the preference name. Changes take effect immediately.
4. Enable tab focus on text fields, form elements, and links by setting this accessibility preference.
    
      
    | Preference | Recommended Value | Default Value |
    | --- | --- | --- |
    | accessibility.tabfocus | 7 | 1 |
5. Change how the browser retains common resources across requests by setting these caching preferences.
    
      
    | Preference | Recommended Value | Default Value |
    | --- | --- | --- |
    | browser.cache.check\_doc\_frequency | 3 | 3 |
    | browser.cache.disk.capacity | 50,000 or more; increase to use more hard disk space | 50,000 |
    | browser.cache.disk.enable | True | True |
    | browser.cache.disk\_cache\_ssl | True | False |
    | browser.cache.memory.enable | True | True |
6. Change how the browser retains common resources across requests by setting these caching preferences.
    
    You can set some of these preferences by clicking **Tools** | **Options** in the Firefox browser. Refer to [Firefox Help](http://support.mozilla.com) for details.

Setting privacy.sanitize.sanitizeOnShutdown to “True” causes the cache to clear when Firefox shuts down. This increases privacy, but can decrease performance.

To view the contents of your cache, type about:cache in the Firefox location bar and press Enter.

Refer to [MozillaZine Knowledge Base](http://kb.mozillazine.org) and [Firefox Support Home Page](http://support.mozilla.com) for more information on these and other preferences.