Proxy functionality doesnt seem to work

[JorySeverijnse]

Bug Report

Description

When a proxy is configured, the browser is not properly configured to use it
when no proxy is selected, Firefox is set to "Manual proxy configuration" mode instead of "No proxy" (Direct connection).

Is this a regression?

not tested in earlier versions

Minimal Reproduction

1. Configure a SOCKS5 proxy (e.g., 127.0.0.1:9050) in Donutbrowser's proxy management.
2. Assign the proxy to a Firefox-based profile (Firefox, Firefox Developer, or Zen).
3. Launch the profile and check Firefox's proxy settings (about:config or Preferences > Network Settings).
4. Observe that proxy settings are not correctly configured, and traffic does not go through the proxy.
5. Remove the proxy assignment from the profile.
6. Launch the profile again.
7. Observe that Firefox still shows "Manual proxy configuration" instead of "No proxy".

Your Environment

• Donutbrowser version: 0.13.9
• Browser: Firefox 128.0+
• Arch linux
• Proxy type tested: SOCKS5 (Tor proxy at 127.0.0.1:9050)
• Verification: curl --socks5 localhost:9050 https://ifconfig.me works correctly outside the app

Exception or Error or Screenshot

Additional Context

[github-actions]

🤖 Issue Validation

Issue Type Detected: bug_report

Assessment: This is a well-formulated bug report with a clear description of the problem, reproducible steps, and detailed environment information. However, including visual evidence (e.g., screenshots or logs) and more specifics about the browser version would further strengthen the report.

💡 Suggestions:

• Add screenshots or logs of the observed Firefox proxy settings to provide clearer evidence of the issue.
• Include more detailed information about browser versions, such as the specific Firefox version (e.g., 128.0.x), if available.
• Clarify whether the proxy configuration has worked in previous versions of Donut Browser or if this is a first-time setup issue.---
  This validation was performed automatically to help triage issues.