Firefox mv3 build changes

[justindbaur]

🎟️ Tracking

📔 Objective

Update workflow to prepare for release of the MV3 version of our browser extension for Firefox. We are doing this change for both Opera and Firefox but they are done separately so that we can easily revert this PR if we run into issues during regression with the new version.

Related: #13365

📸 Screenshots

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.29%. Comparing base (5f2a773) to head (45220fb).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13366   +/-   ##
=======================================
  Coverage   35.29%   35.29%           
=======================================
  Files        3124     3124           
  Lines       92349    92349           
  Branches    16793    16793           
=======================================
  Hits        32593    32593           
  Misses      57299    57299           
  Partials     2457     2457           

☔ View full report in Codecov by Sentry.
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[github-actions]

Checkmarx One – Scan Summary & Details – 3ff61463-01fb-4903-afa4-f652c522aaf8

Great job, no security vulnerabilities found in this Pull Request