A browser sidebar assistant can read the tab you're looking at

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An assistant that lives in the browser's sidebar is different from one opened in its own tab: it sits next to whatever page is already open, and the useful trick of asking it to summarize the current page depends on the sidebar seeing that page's content without being told to. That same access is worth understanding before treating the sidebar like a private notepad next to the browser.

What the documents say

Microsoft's page on Copilot in Edge, retrieved 16 September 2026, states that 'Copilot can analyze content across many open tabs at once, combining insights to answer questions, compare information, and surface key takeaways in one place,' and notes that some conversations are 'subject to both automated and human review for... product improvement and digital safety purposes.' The page states a user can 'choose which features to use, and switch them on or off' and manage personalization separately in account settings. Google's help page 'Use Gemini in Chrome', retrieved the same day, describes a similar but distinct default: 'Gemini in Chrome uses content from your current browser tab' automatically, and a user can additionally 'share up to 10 of your open tabs' beyond that. The page adds that the feature is unavailable in Incognito mode, requires signing into Chrome, and that on connected Workspace pages 'Gemini may directly access your Workspace account.' Both companies describe the sidebar's page-reading as the intended mechanism behind its usefulness, not an incidental side effect.

Check this

The check that matters is the tab-sharing setting itself: Chrome's page states the current tab is shared by default, so a reader should find the control that limits sharing to only the intended tab, rather than assuming a sidebar assistant only reads what is typed into it. On Edge, the equivalent check is the personalization toggle in account privacy settings, described as separate from turning Copilot off entirely.

What holds and what fails

The sidebar's page-reading holds exactly as documented, as a stated default rather than a hidden behaviour, for the browser version and account type each page describes; it does not guarantee every open tab stays private from the assistant, since both products default to at least the active tab being visible. It fails as a safe place for content a reader would not want reviewed under either policy, given Microsoft's own note that some conversations undergo human review. This is a setting to check, not a reason to avoid the feature, which is an editorial framing beyond what either page states.

• Find the browser's tab-sharing setting for its AI sidebar before assuming only the active page is visible.
• Close or exclude tabs with sensitive content before asking the sidebar to compare across open tabs.
• Check whether the account is signed in and outside Incognito mode, since both affect what the sidebar can do.

A sidebar assistant's usefulness and its access are the same mechanism described from two directions; the practical step is checking which tabs are shared, not whether the feature can be trusted in the abstract.