MV3 e2e tests for firefox

## Context

This ticket is to ensure that all of our mv3 e2e tests run, and pass, on firefox, once we start creating mv3 builds for firefox

## Approach

After [17901](https://app.zenhub.com/workspaces/metamask-extension-63529dce65cbb100265a3842/issues/gh/metamask/metamask-extension/17901) passes, we should implement a separate job for running the tests with the mv3 environment flag with the Firefox build type.

## Acceptance criteria

- Implement a new pipeline job for mv3 with firefox build type
- Fix any tests as needed to get the job passing

Review issue 17901 and the existing MV3 end-to-end test pipeline jobs first. Add a separate job using the MV3 environment flag and Firefox build type, then address any failing tests until the job passes.

Written by the indexing model from the issue text.