Reddit’s Firefox community is a hive of activity where users share hidden gems, tips, and tools to get the most out of Mozilla’s powerful browser. In 2025, users are focusing on add-ons that enhance privacy, productivity, and user interface customization like never before. Among thousands of extensions available, certain add-ons have earned cult status—especially ones built around container tabs, sleek UI overhauls, and smart time-saving features.
TL;DR: Redditors in 2025 are loving Firefox add-ons that improve tab management, privacy through containers, and tweak the browser UI for better usability. Extensions like “Temporary Containers” and “Sidebery” are especially popular for compartmentalizing life online. UI boosters such as “Tree Style Tab” and “Dark Reader” also top the community’s favorites. Below are the seven most talked-about Firefox add-ons that Reddit users can’t get enough of this year.
Contents
1. Temporary Containers
Category: Privacy, Containers
Arguably the most loved Firefox add-on among Reddit users in 2025, Temporary Containers is a powerhouse for anyone serious about privacy. It works by automatically opening websites in isolated containers, preventing them from tracking users across sites.
Unlike Firefox’s built-in Multi-Account Containers, which require manual setup for each domain, Temporary Containers does this on the fly. Many Redditors praise the add-on for reducing cross-website tracking and offering a feeling of digital cleanliness while browsing.
Highlights:
- Prevents cookies from lingering across domains
- Zero setup needed — fully automatic
- Works well alongside other privacy tools like uBlock Origin
2. Sidebery
Category: Tab Management, UI Tweaks
If managing dozens (or hundreds) of open tabs is your struggle, Reddit has one word for you: Sidebery. This add-on completely overhauls Firefox’s tab interface into a vertical tree-style layout, allowing for easier navigation and workspace organization.
Sidebery lets users group tabs in columns, assign them to specific workspaces, and even combine it with containers for ultra-compartmentalized browsing. It’s rich in customization options and loved by power users who juggle multiple projects at once.
Highlights:
- Vertical tab tree with collapsible folders and groups
- Workspace support for project-specific browsing
- Integrates seamlessly with Firefox Containers
3. Multi-Account Containers
Category: Privacy, Container Tabs
Firefox’s officially supported Multi-Account Containers still stands tall in 2025. Recently updated with a cleaner UI and better sync support, this add-on lets users assign websites to separate containers (work, shopping, banking, etc.) and color-code them for distinction.
Redditors use it to stay logged into multiple accounts on the same site (e.g., Gmail for personal & work), and to prevent advertisers from tracking their activity across different categories of websites.
Highlights:
- Create isolated containers for specific tasks
- Supports site-specific color-coding
- Perfect for managing multiple logins and reducing tracking
4. Tree Style Tab
Category: UI Tweaks, Tab Management
Among forums and r/Firefox threads, Tree Style Tab is praised for offering a “developer’s dream” interface. By turning tabs into a collapsible tree on the side, users can manage tab hierarchies logically, reflecting how their research or work session unfolds.
New tabs opened from a parent will automatically nest below them. For Redditors who do lots of research or coding, this organization makes more sense than horizontal tabs.
Highlights:
- Nested, tree-like tab organization
- Extremely useful for research and documentation
- Highly customizable appearance and behavior
5. Dark Reader
Category: UI Enhancements, Accessibility
Light mode fatigue is real. Dark Reader continues to be one of the most downloaded and talked about Firefox add-ons on Reddit. It dynamically generates dark themes for any website, making late-night browsing easier on the eyes.
This isn’t a simple color inversion; it adjusts contrast and brightness intelligently. Redditors report fewer headaches and better focus thanks to Dark Reader, and many consider it a must-have for all-day browsing.
Highlights:
- Applies dark mode across all websites
- Customizable per-site settings
- Advanced options for brightness, contrast, and sepia tones
6. Tab Stash
Category: Productivity, Tab Management
Tab overload is a problem across browsers, and Redditors love using Tab Stash to tackle it. This add-on acts like a stash box for your open tabs. With just a click, it gathers and organizes all open tabs into a sidebar list, freeing up space and memory.
Users like that it works offline and doesn’t require account sign-ins. Plus, you can search, filter, and restore tabs anytime. Tab Stash’s simplicity is its strength, making it a fan-favorite among minimalist users.
Highlights:
- Instantly declutters your tab bar
- Bookmark-like organized groups
- Open-source and privacy-respecting
7. Firefox Color
Category: UI Customization
For users who want to truly personalize Firefox’s aesthetic, Firefox Color is the extension to get. Redditors are frequently posting screenshots of their custom themes using this playful tool.
Launched by Mozilla itself and updated for 2025 with new gradient controls, Firefox Color allows users to tweak everything—from tab bar and highlights to text color and icons. It’s a joy for those who want function and flair together.
Highlights:
- Full browser color customization
- No coding required — intuitive color pickers
- Community theme gallery for inspiration
Conclusion
In 2025, Firefox’s flexibility remains one of its strongest assets, and Reddit users are more creative and security-minded than ever. Whether it’s creating layered containers for ultimate browsing hygiene or styling the browser to reflect your personality, these seven add-ons continue to evolve with user demands. Any Firefox user looking to increase productivity, privacy, or eye comfort will find these extensions indispensable.
FAQ
- Q: Do these add-ons slow down Firefox?
A: While some extensions like tab managers can use a bit more memory, most on this list—including Temporary Containers and Dark Reader—are praised for being lightweight and efficient. - Q: Can I use Temporary Containers and Multi-Account Containers together?
A: Yes! Many Redditors use them in tandem. Temporary Containers for automated isolation and Multi-Account Containers for persistent container setups. - Q: Are these Firefox add-ons available on mobile?
A: Unfortunately, most container and UI tweak extensions are only supported on Firefox’s desktop version. Mobile support is still limited. - Q: How safe is it to use these add-ons?
A: All the extensions listed are trusted by the Reddit and Mozilla community, many are open-source, and routinely updated. Always download from the official Firefox Add-ons site. - Q: Can I sync container settings across multiple devices?
A: Yes, Multi-Account Containers sync works well when Firefox Sync is enabled. Be sure to log into your account across devices.