YouTube videos not detected if they require sign-in, i.e. videos that 'may be inappropriate'

[jdetroit]

Your question

On YouTube, I see that if I visit a video that requires sign-in, VDLH will not recognize any media to process on the page -- even if I am signed in.

YouTube message on video when not signed in:
"Sign in to confirm your age
This video may be inappropriate for some users"

After signing in to see the video, VDLH still fails to detect any media to process on the page.

I tested which videos needed sign-in with a private Firefox instance, and saw that YouTube videos that did not require sign-in were detected by VDLH (whether signed in or not), but videos requiring sign-in were not detected, even after signing in.

Example YouTube videos requiring sign-in (content warning, somewhat NSFW):
https://www.youtube.com/watch?v=VioGfCgCzQo
https://www.youtube.com/watch?v=j6m0N5MWp3o

Using Firefox 141.0.3 (64-bit) on Windows 10

Addon & CoApp version and details

version: 9.5.0.2
target: mozilla
channel: stable
lang: en-US
coapp: {"found":true,"path":"C:\Program Files\DownloadHelper CoApp\vdhcoapp.exe","version":"2.0.19","new_version":false}
license: {"accepted":true,"email":"","key":"ab8f97affb024f69"}
platform: x86-64 win
UA: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0
{
"valid_license_message_has_been_displayed": true,
"privacy_accept": true,
"used_history_button": true,
"view_options": {
"all_tabs": false,
"low_quality": false,
"sort_by_status": true,
"sort_reverse": false,
"show_button_clean": true,
"show_button_clean_all": true,
"show_button_convert_local": false,
"hide_downloaded": false
},
"use_sidebar": true,
"open_count_store": 2,
"successfull_dl": 6
}