You have not mentioned what all you have done nor have you mentioned what you meant by the kitchen sink. So let us start with the basics Can you please check if you are able to play YouTube videos in safe mode, aka troubleshooting mode. To go to Safe mode use the following path

Menu > Help > Troubleshooting Mode.

If it works fine then there is a problem in one of your extensions. Start by disabling your extensions one by one see what solves the problem.

If it does not work then the Firefox browser or one of the codecs might be corrupted. Then in that case you have to uninstall Firefox completely. Before you head to add/remove programs do the following. 1) Go to Menu > Help > More troubleshooting information

Copy the path of the update folder and profile folder. put them somewhere in a text file. 2) Uninstall Firefox. 3) Restart your windoze system. 4) Open explorer and go to the update folder that you kept in Step 1. and delete all the files under it. Do the same for profile folder. The value of profile folder will be something like the one given below C:\Users\<User>\AppData\Roaming\Mozilla\Firefox\Profiles\XXXXXXXX.default-release

The <User> will be replaced by your user name. The value of XXXXXXXX.default-release will be different for you. We are interested in the path C:\Users\<User>\AppData\Roaming\Mozilla\Firefox\Profiles\

Delete everything under Profiles. This will make you loose all of your bookmarks, settings, passwords, etc. So back them up before doing this. If you use multiple profiles then do this for all the profiles and then delete everything under Profiles folder. Then go to C:\Users\<User>\AppData\Roaming\Mozilla\ and delete the folder Firefox.

5) Reinstall Firefox browser and check if the issue is still occurring.

no firefox still crashes no matter whether im on youtube or opening closing or browsing another page. this is the last crash from the event viewer in windblows Log Name: Application Source: Application Error Date: 7/19/2024 3:12:06 PM Event ID: 1000 Task Category: Application Crashing Events Level: Error Keywords: User: X Computer: X Description: Faulting application name: firefox.exe, version: 128.0.0.2295, time stamp: 0x6686b62a Faulting module name: xul.dll, version: 128.0.0.2295, time stamp: 0x6686b68b Exception code: 0xc0000409 Fault offset: 0x000000000266982d Faulting process id: 0x0x105C Faulting application start time: 0x0x1DADA28690F6D67 Faulting application path: C:\Program Files\Mozilla Firefox\firefox.exe Faulting module path: C:\Program Files\Mozilla Firefox\xul.dll Report Id: ef22ede9-e0c9-4f1b-a1bd-3a610d046e01 Faulting package full name: Faulting package-relative application ID: Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">

 <System>
   <Provider Name="Application Error" Guid="{a0e9b465-b939-57d7-b27d-95d8e925ff57}" />
   <EventID>1000</EventID>
   <Version>0</Version>
   <Level>2</Level>
   <Task>100</Task>
   <Opcode>0</Opcode>
   <Keywords>0x8000000000000000</Keywords>
   <TimeCreated SystemTime="2024-07-19T22:12:06.5585951Z" />
   <EventRecordID>66459</EventRecordID>
   <Correlation />
   <Execution ProcessID="12268" ThreadID="23600" />
   <Channel>Application</Channel>
   <Computer>X</Computer>
   <Security UserID="S-1-5-21-1031570895-3094223114-2762588158-1001" />
 </System>
 <EventData>
   <Data Name="AppName">firefox.exe</Data>
   <Data Name="AppVersion">128.0.0.2295</Data>
   <Data Name="AppTimeStamp">6686b62a</Data>
   <Data Name="ModuleName">xul.dll</Data>
   <Data Name="ModuleVersion">128.0.0.2295</Data>
   <Data Name="ModuleTimeStamp">6686b68b</Data>
   <Data Name="ExceptionCode">c0000409</Data>
   <Data Name="FaultingOffset">000000000266982d</Data>
   <Data Name="ProcessId">0x105c</Data>
   <Data Name="ProcessCreationTime">0x1dada28690f6d67</Data>
   <Data Name="AppPath">C:\Program Files\Mozilla Firefox\firefox.exe</Data>
   <Data Name="ModulePath">C:\Program Files\Mozilla Firefox\xul.dll</Data>
   <Data Name="IntegratorReportId">ef22ede9-e0c9-4f1b-a1bd-3a610d046e01</Data>
   <Data Name="PackageFullName">
   </Data>
   <Data Name="PackageRelativeAppId">
   </Data>
 </EventData>

</Event>