Metamask Firefox addon not loading at all

### What is this about?

The MetaMask Firefox extension is not loading properly. I tried updating Firefox or trying old versions of MetaMask and the extension remains unresponsive. It stopped working suddently.


MM version: 11.12.4
Firefox: 125.0.1 (64-bit)
OS: Windows

### Scenario

1. Open Firefox.
2. Attempt to open the MetaMask extension.
3. Notice that the extension is stuck on a loading icon and does not open.

### Design

_No response_

### Technical Details

_No response_

### Threat Modeling Framework

_No response_

### Acceptance Criteria

The MetaMask extension opens without issues in Firefox.

### Stakeholder review needed before the work gets merged

- [ ] Engineering (needed in most cases)
- [ ] Design
- [ ] Product
- [ ] QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management (please specify)
- [ ] Other (please specify)

### References

_No response_

Start by reproducing the loading failure in Firefox 125.0.1 on Windows with MetaMask 11.12.4, following the reported steps. Investigate the extension's loading behavior and verify that the MetaMask extension opens normally in Firefox without remaining on the loading icon.

Written by the indexing model from the issue text.