Firefox has long been the browser of choice for users...
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Firefox has long been the browser of choice for users who value privacy, customization, and control. But like any software, it can slow down over time due to background processes, excessive memory use, or non optimized defaults.
In this updated 2025 guide, we’ll cover every Firefox optimization tweak, from memory and cache tuning to process management and privacy hardening, including a powerful advanced tweak that can significantly improve speed even on low resource machines.
1️⃣ General Performance Tweaks
🧭 Disable Smooth Scrolling
Smooth scrolling looks sleek but consumes unnecessary CPU power.
- Visit:
about:config - Set:
general.smoothScroll=fales
⚙️ Reduce Content Process Limits
Firefox creates multiple content processes for stability. Reducing the number helps conserve memory.
- Go to:
about:preferences > General > Performance - Uncheck Use recommended performance settings
- Set Content process limit to 2 or 4
🌐 Enable HTTP/3 and DNS over HTTPS (DoH)
Improve browsing speed and security with encrypted DNS queries.
- Go to:
about:preferences > Privacy & Security - Scroll to DNS over HTTPS and enable it
- Choose Cloudflare (default) or another trusted resolver like NextDNS
2️⃣ Memory and Cache Tweaks
💾 Disable Disk Cache (if You Have Enough RAM)**
Disabling the disk cache reduces SSD wear and improves responsiveness.
- Set:
browser.cache.disk.enable = falsebrowser.cache.memory.enable = true
🔁 Limit Session Restore Tabs
Limit the number of tabs Firefox keeps in memory for session restore.
- Set:
browser.sessionstore.max_tabs_undo = 2browser.sessionstore.max_windows_undo = 1
💤 Enable Automatic Tab Unloading
Automatically unload inactive tabs when memory is low.
- Set:
browser.tabs.unloadOnLowMemory = truebrowser.tabs.min_inactive_duration_before_unload = 300
3️⃣ Privacy and Background Optimization
🧠 Disable Telemetry and Data Collection
Stop Firefox from sending anonymous data and analytics to Mozilla.
- Set:
toolkit.telemetry.enabled = falsedatareporting.healthreport.uploadEnabled = falsebrowser.ping-centre.telemetry = false
🛑 Stop Background Services
Disable background experiments and tracking scripts.
- Set:
browser.newtabpage.activity-stream.feeds.telemetry = falsebrowser.newtabpage.activity-stream.telemetry = falseapp.normandy.enabled = falseapp.shield.optoutstudies.enabled = false
4️⃣ Network and Rendering Tweaks
💻 Force GPU Rendering (WebRender)
Use GPU acceleration to boost rendering and reduce CPU load.
- Set:
gfx.webrender.all = true
🔄 Enable Parallel Networking
Increase simultaneous connections for faster loading times.
- Set:
network.http.max-connections = 1800network.http.max-persistent-connections-per-server = 10
🧩 Shorten DNS Cache Lifetime
Prevent stale DNS entries for users with changing IPs.
- Set:
network.dnsCacheExpiration = 60network.dnsCacheExpirationGracePeriod = 30
5️⃣ Advanced Memory and Process Tuning (The Big Performance Boost)
This is one of the most impactful Firefox tweaks which dramatically improves responsiveness even on low resource systems by optimizing how Firefox handles memory and process management.
⚙️ Increase the Process Count for Web Content
By default, Firefox uses a limited number of content processes. Increasing this improves parallelism without bloating memory usage.
- Set:
dom.ipc.processCount = 4
💾 Set Memory Cache Limit for Smoother Browsing
This tweak optimizes memory allocation per content process for faster page reloads and scrolling.
- Set:
browser.cache.memory.capacity = 256000
🔹 What it does:
Allocates 256 MB of RAM to Firefox’s in memory cache, striking the ideal balance between speed and efficiency.
Pages load faster, tabs switch instantly, and fewer assets need to be re fetched from the network.
✅ Why It Works
Together, these two settings:
- Reduce lag when switching tabs
- Improve rendering speed under load
- Prevent excessive reloading of cached content
- Deliver smoother multitasking even on systems with limited resources
These tweaks are safe, reversible, and compatible with both Linux and Windows builds of Firefox.
Conclusion
With the right Firefox optimization tweaks, you can transform Mozilla’s browser into a fast, efficient, and privacy centric powerhouse.
Whether you’re running a low power laptop or a high end workstation, these settings let you take full control of performance while keeping telemetry and background data collection to a minimum.
The best part? Firefox remains open source, transparent, and fully yours to tune, and that’s what makes it the perfect browser for 2025.
Call to Action
Have you tried these Firefox optimization tweaks yet?
Share your results in the comments below and subscribe to EagleEyeT for more performance, privacy, and Linux focused tech guides.
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