Update faq to mention Firefox Webserial support

[burnsie-la]

Firefox now supports Webserial as of Firefox 151. https://www.firefox.com/en-GB/firefox/151.0/releasenotes/

Updated these FAQs to reflect that.

Description

Related issue (if applicable): fixes FAQ

Pull request in esphome with YAML changes (if applicable):

• esphome/esphome# N/A

Checklist

• I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• Link added in /src/content/docs/components/index.mdx when creating new documents for new components or cookbook.

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ℹ️ Recent review info

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Configuration used: Organization UI

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Run ID: 264dfcdd-d6cb-4829-88ee-fa113080abe6

📥 Commits

Reviewing files that changed from the base of the PR and between 1378b36 and dfc3ab1.

📒 Files selected for processing (1)

• src/content/docs/guides/faq.mdx

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Walkthrough

Updated the ESPHome FAQ "USB installation" instructions to add Firefox to the list of supported browsers for WebSerial functionality. The browser compatibility language was updated consistently in both the quick-start and manual installation sections.

Changes

Browser Compatibility Documentation

Layer / File(s)	Summary
WebSerial browser compatibility updates src/content/docs/guides/faq.mdx	Updated two instances of the supported browser list to include Firefox in addition to Google Chrome and Microsoft Edge in the WebSerial installation instructions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested reviewers

• jesserockz

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title accurately summarizes the main change: updating FAQ documentation to mention Firefox WebSerial support, which directly matches the changeset.
Description check	✅ Passed	The description is directly related to the changeset, providing context about Firefox 151's WebSerial support and clearly explaining the updates made to the FAQ documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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