Update webcompat definition for Firefox unsupported cases - #6747

[taskcluster 2026-08-31T21:25:19.161Z] Worker Type (proj-bugbug/batch) settings:
[taskcluster 2026-08-31T21:25:19.161Z]   {
[taskcluster 2026-08-31T21:25:19.161Z]     "generic-worker": {
[taskcluster 2026-08-31T21:25:19.161Z]       "config": {
[taskcluster 2026-08-31T21:25:19.161Z]         "headlessTasks": false
[taskcluster 2026-08-31T21:25:19.161Z]       },
[taskcluster 2026-08-31T21:25:19.161Z]       "engine": "multiuser",
[taskcluster 2026-08-31T21:25:19.161Z]       "go-arch": "amd64",
[taskcluster 2026-08-31T21:25:19.161Z]       "go-os": "linux",
[taskcluster 2026-08-31T21:25:19.161Z]       "go-version": "go1.26.2",
[taskcluster 2026-08-31T21:25:19.161Z]       "release": "https://github.com/taskcluster/taskcluster/releases/tag/v99.1.0",
[taskcluster 2026-08-31T21:25:19.161Z]       "revision": "c76d61efe4bdc1a05bcec848739cd41ebf061f01",
[taskcluster 2026-08-31T21:25:19.161Z]       "source": "https://github.com/taskcluster/taskcluster/commits/c76d61efe4bdc1a05bcec848739cd41ebf061f01",
[taskcluster 2026-08-31T21:25:19.161Z]       "version": "99.1.0"
[taskcluster 2026-08-31T21:25:19.161Z]     },
[taskcluster 2026-08-31T21:25:19.161Z]     "image": "projects/community-tc-workers/global/images/generic-worker-ubuntu-24-04-aaynirqnxlbwcojgnbeo",
[taskcluster 2026-08-31T21:25:19.161Z]     "instance-id": "8989074298206965313",
[taskcluster 2026-08-31T21:25:19.161Z]     "instance-type": "projects/757942385826/machineTypes/n2-standard-2",
[taskcluster 2026-08-31T21:25:19.161Z]     "local-ipv4": "10.150.0.106",
[taskcluster 2026-08-31T21:25:19.161Z]     "machine-setup": {

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[INFO] Initializing environment for https://github.com/pre-commit/mirrors-mypy:types-pkg_resources==0.1.2,types-python-dateutil==2.9.0.20260716,types-PyYAML==6.0.12.20260724,types-orjson==3.6.2,types-tabulate==0.10.0.20260508,types-requests==2.33.0.20260712.
[INFO] Initializing environment for https://github.com/pre-commit/mirrors-mypy:types-pkg_resources==0.1.2,types-requests==2.33.0.20260712,types-Flask==1.1.6,types-redis==4.6.0.20241004,types-python-dateutil==2.9.0.20260716,types-orjson==3.6.2,types-tabulate==0.10.0.20260508.
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prettier.................................................................Failed
- hook id: prettier
- files were modified by this hook

agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/prompts/system.md

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Check for useless excludes...............................................Passed
pre-commit hook(s) made changes.
If you are seeing this message in CI, reproduce locally with: `pre-commit run --all-files`.
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All changes made by hooks:
diff --git a/agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/prompts/system.md b/agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/prompts/system.md
index ec4e5c1a..c9367a4d 100644
--- a/agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/prompts/system.md
+++ b/agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/prompts/system.md
@@ -38,7 +38,7 @@ includes:
 - Blocking Firefox outright, or serving it a degraded/legacy experience,
   based on user-agent sniffing.
 
-Treat these as webcompat - the recommendation or block is itself 
+Treat these as webcompat - the recommendation or block is itself
 the issue to report.
 
 Issues with the browser UI are not webcompat issues unless they
[taskcluster 2026-08-31T21:27:37.713Z]                        Exit Code: 1
[taskcluster 2026-08-31T21:27:37.713Z]                        User Time: 25.23ms
[taskcluster 2026-08-31T21:27:37.713Z]                      Kernel Time: 49.41ms
[taskcluster 2026-08-31T21:27:37.713Z]                        Wall Time: 1m54.386899265s
[taskcluster 2026-08-31T21:27:37.713Z]  Average Available System Memory: 6.32 GiB
[taskcluster 2026-08-31T21:27:37.713Z]       Average System Memory Used: 1.43 GiB
[taskcluster 2026-08-31T21:27:37.713Z]          Peak System Memory Used: 1.73 GiB
[taskcluster 2026-08-31T21:27:37.713Z]              Total System Memory: 7.75 GiB
[taskcluster 2026-08-31T21:27:37.713Z]                           Result: FAILED
[taskcluster 2026-08-31T21:27:37.714Z] === Task Finished ===
[taskcluster 2026-08-31T21:27:37.714Z] Task Duration: 1m54.387989009s
[taskcluster:error] exit status 1