A browser extension can make an ordinary task easier while asking for more access than you expected. The useful question is specific: what must this extension see or change to do the job you actually want? Write that answer before accepting the next permission prompt. Then compare it with the access requested, the controls your browser offers and the developer's explanation of data use.
This guide helps people reviewing extensions on their own desktop computers. Work or school devices may be managed: follow your organization's rules and ask its administrator when a setting is unavailable. Do not bypass a managed restriction. No particular extension is recommended here, and a short checklist cannot prove software safe.
Separate three decisions
Treat the task, the browser permission and the handling of collected data as separate entries in a small ledger. A tool might need to inspect a page to perform a function. That explains a possible capability requirement; it does not answer whether information leaves the device, who receives it or how long it remains there. A useful product description should help you connect the function with both kinds of question.
| Decision | Record in your own words | A useful reason to pause |
|---|---|---|
| Task | The particular feature and the sites where you need it | The extension duplicates a browser feature you already use |
| Access | The permission wording and the narrowest working scope offered | The requested scope is broader than the task and the explanation is missing |
| Data handling | The developer's current explanation of collection, transmission and retention | You cannot establish what happens to material from a sensitive page |
| Choice | Decline, remove, or use a documented limited configuration | You would need to experiment with passwords or confidential records to find out |
These are Inquory's decision prompts. They are not a browser-vendor approval process or a malware detector. Keep the ledger private; it should contain settings and reasons, never credentials or copies of confidential page content.
What broad website access can mean
Mozilla explains that an extension with access to data on all websites could read page content and information entered into those pages, including usernames and passwords. Legitimate functions, such as password management and content blocking, can also use broad access. The wording therefore describes a capability that needs a reason; it does not by itself establish malicious behavior. A permission limited to a named domain still concerns content and input on that domain. Mozilla: permission request messages
Write the exact warning from the installation or settings screen. Avoid translating it into a comforting label such as “only helps shopping.” If the feature works on a single site, ask why access to other sites is needed. If it must work across many sites, decide whether that benefit justifies the broader reach in your situation. An unanswered question is a valid reason to decline the tool.
Check the controls your browser actually provides
Chrome's desktop extension controls can limit site access to selection, a specified site or all sites, where the extension supports the relevant host permissions. In the extension's details, review its site-access setting and allowed sites. Google warns that changing site permissions does not affect extensions that alter lower-level network access through VPN or proxy settings. Do not interpret a narrower site list as a universal switch for every permission an extension holds. Google: install and manage extensions
Firefox distinguishes required permissions from optional permissions that support additional functionality. In Add-ons Manager, open the extension's details and its permissions section; optional controls can be changed there. If a particular permission is not optional, do not assume there is a switch to revoke only that part while keeping the extension fully functional. Review the actual screen and the developer's instructions. Mozilla: optional extension permissions
The names and available controls can vary with the browser version and the extension. Record which browser and version you checked. Start from the browser's extension manager, rather than an unsolicited message offering to “fix” your permissions. This guide's instructions concern desktop Chrome and Firefox; they do not establish equivalent controls on a phone or in another browser.
Read the data explanation separately
Mozilla documents a data-collection consent experience for extensions installed on Firefox 140 and later. Its documentation distinguishes personal data from technical and interaction data and describes the categories presented to users. Check the actual disclosure and any available choices for the extension you are considering; do not infer that every older extension uses an identical screen. Mozilla: extension data collection
For your ledger, record the developer's stated purpose and the date you read it. A permission prompt tells you something about capability; a privacy statement tells you what the developer says it does. Neither is independent verification of the developer's behavior. If those accounts conflict or leave a critical question unanswered, postponing installation is a reasonable outcome. Do not submit sensitive material merely to test an explanation.
A fictional decision: one reading site, three outcomes
Imagine Mira wants a hypothetical extension that reformats long articles on one public reading site. This example is invented; it is not a test, endorsement or allegation about a real product.
Mira first checks whether the browser's existing reading options solve the problem. If they do, she records “no extension needed.” If the extra feature matters, she records the requested access and looks for a supported site-specific setting. She could then try the desired function on a non-sensitive public article and note whether it works. A successful functional check would show only that the feature worked in that limited situation, not that the extension was safe or complied with its privacy statement.
If the hypothetical developer requires broader access and does not explain why, Mira can decline it. If a limited configuration works and she accepts the remaining uncertainty, she records that choice and a review date. There is no invented score declaring that one answer is safe for everyone. Someone using a managed computer must instead use the organization's approved path.
Keep an exit and review record
Revisit the ledger when the task disappears, a new permission prompt appears or your use changes. A calendar reminder is a personal review aid, not a claim that risk follows a fixed schedule. For an unused tool, review its own data/export guidance before removal if you have useful records stored with it; do not assume uninstalling also deletes a remote account or previously transmitted data.
Chrome documents removal through the extension menu or manager. Removing an icon from the toolbar merely hides it; use the actual removal control when your decision is to uninstall. Google: install and manage extensions
Complete your ledger with the action taken and what remains unknown. If a work account or sensitive information may already have been exposed, use the organization's incident-support process instead of treating this general checklist as incident response.
A private worksheet to copy
| Field | Your record |
|---|---|
| Browser/version and review date | |
| Extension name, developer and exact store page | |
| Task and sites where it is needed | |
| Exact requested permissions | |
| Available site-access and optional-permission controls | |
| Developer data explanation, URL and date checked | |
| Non-sensitive functional check and its limits | |
| Decision, unresolved questions and next review reason | |
| Removal/export steps if the tool is no longer needed |
For the next step, use Inquory's app export and exit plan when records need preserving, and its passkey recovery plan for a separate account-recovery question. Browser-extension permissions and account recovery require different checks.
Sources and method
Inquory reopened the linked Google and Mozilla documentation on October 6, 2026. These are primary descriptions of their respective browsers; they are not independent tests of an extension. No malicious-extension allegation, measured security outcome, product price, affiliate offer or hands-on test is asserted. The ledger and fictional example are Inquory's original practical interpretation. Recheck current documentation and the actual browser interface before changing a configuration.