Browser extensions can add useful functions such as managing passwords or improving page readability. They are also software with permissions and an update lifecycle. A periodic review is a practical way to keep your browser understandable, especially if it handles work documents, account sign-ins and sensitive conversations throughout the day.
Inventory what is installed
Open the browser's supported extension-management area and list the tools you recognise. For each one, note its purpose, publisher and whether you still use it. An extension installed for a single project two years ago may no longer justify remaining active. Remove unused tools through the browser's normal controls rather than merely hiding their toolbar icons.
On a managed work browser, follow the organisation's instructions. Some extensions may be required, and removing them without understanding their role can disrupt supported work. Ask the relevant administrator about tools you cannot identify. The inventory should make ownership clearer, not encourage a series of unexplained changes.
Read permissions in relation to the task
Mozilla's documentation explains that extensions may request permissions for data or browser features and that some optional permissions can be managed later. Read the prompt carefully and compare it with the advertised purpose. A function affecting every page may need broader access than a tool used only when you click its button, but you should still understand the scope.
Ask a plain question: what information might this tool encounter while doing its job? Consider pages, downloaded files or browsing activity where the requested permissions make them relevant. A privacy statement should explain the provider's practices; permissions explain technical access. Both matter, and neither alone tells you everything about how a particular extension behaves.
Install through a deliberate route
Use the browser's official distribution route or the approved workplace mechanism. Check the publisher, current documentation and the intended function before installing. Popularity and a polished listing do not replace understanding permissions. Avoid adding an extension solely because a random page says it is required to continue reading, download a file or fix your browser.
If two tools do the same task, consider whether both are necessary. Overlap can introduce conflicts and make troubleshooting harder. Start with one change at a time and verify the effect on the pages you depend on. Keep a note of a new installation if it changes your working environment substantially.
Check private-window behaviour separately
An extension's availability in private browsing depends on the browser and its permissions. Mozilla documents that Firefox users can choose which supported extensions may run in private windows. Do not assume a tool is active there merely because it works in an ordinary tab. Equally, permitting it in a private window may give it access to information handled in that session.
If you need a tool for a particular private-window task, read the current browser guidance and make the decision explicitly. Private browsing and extension permissions are different controls. A private session does not neutralise every permission you grant, and a disabled extension cannot provide a function you are relying on inside that session.
Troubleshoot with controlled changes
When a website behaves unexpectedly, test a clean browser profile or the browser's supported troubleshooting mode where available. Compare the same task without optional extensions. This can help identify whether an extension is involved without permanently deleting everything. Keep account security and workplace policies in mind when choosing the test environment.
Re-enable necessary tools individually and repeat the relevant task. Record which change affects the behaviour. Review extensions after a role change, a major browser update or a new privacy requirement. A well-maintained extension collection is small enough to explain, current enough to support and explicit about the access you have chosen to grant.
Sources and further reading
- Mozilla Support: Manage optional permissions for Firefox extensions
- Mozilla Support: Extensions in Private Browsing
This original guide was prepared with AI assistance. Examples are illustrative. The edition date is an assigned date in this 2026 catalogue. See our editorial policy and report a correction.