I created [a Github repository](https://github.com/yjugl/bug1823412) to share the reproducer. Steps to reproduce: - Install [the latest Microsoft Visual C++ Redistributable package for x64](https://aka.ms/vs/17/release/vc_redist.x64.exe). - Download `HookTests.exe` and `HookLib.dll` from [the release section of the repository](https://github.com/yjugl/bug1823412/releases/tag/v1.0). Keep them in the same folder. - (Recommended) Check integrity of the files from a Powershell window. The hashes on your computer should match: ``` PS > Get-FileHash .\HookTests.exe Algorithm Hash Path --------- ---- ---- SHA256 5EBEDD581258A1C29F4883B8B443C2B4EF86F442C0D53954AA6E4A8409DAB14D .\HookTests.exe PS > Get-FileHash .\HookLib.dll Algorithm Hash Path --------- ---- ---- SHA256 CC4509C7D621B0F69584FF7FB082C9DC63C178133D03ED362C713DAF065D7C56 .\HookLib.dll ``` - Double click on `HookTests.exe`. SmartScreen prevents you from running the executable. Click `More info`, `Run anyway`. - `HookTests.exe` launches and should show: `SUCCESS: The hook is installed`. - Open Firefox and navigate to `about:third-party`. You should see `HookLib.dll` listed. - In Firefox, click `Reload with system info`. A new button `Block this module` appears near `HookLib.dll`. Click it. Click `Restart Firefox now`. - When Firefox restarts, it should be extremely slow. If you can, navigate to `about:processes`, it should show that the main process and the GPU process together use around 100% of CPU. - Back in `HookTests.exe`, press ENTER, it should show: `SUCCESS: The hook is uninstalled`. Press ENTER again. - Back in Firefox, you should now experience normal performance. - Navigate to `about:third-party`. Click `Reload with system info`. Click the `Currently blocked` button near `HookLib.dll` to unblock the module. Click `Restart Firefox now`.
Bug 1823412 Comment 6 Edit History
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I created [a Github repository](https://github.com/yjugl/bug1823412) to share the reproducer. Steps to reproduce: - Install [the latest Microsoft Visual C++ Redistributable package for x64](https://aka.ms/vs/17/release/vc_redist.x64.exe). - Download `HookTests.exe` and `HookLib.dll` from [the release section of the repository](https://github.com/yjugl/bug1823412/releases/tag/v1.0). Keep them in the same folder. - (Recommended) Check integrity of the files from a Powershell window. The hashes on your computer should match: ``` PS > Get-FileHash .\HookTests.exe Algorithm Hash Path --------- ---- ---- SHA256 5EBEDD581258A1C29F4883B8B443C2B4EF86F442C0D53954AA6E4A8409DAB14D .\HookTests.exe PS > Get-FileHash .\HookLib.dll Algorithm Hash Path --------- ---- ---- SHA256 CC4509C7D621B0F69584FF7FB082C9DC63C178133D03ED362C713DAF065D7C56 .\HookLib.dll ``` - Double click on `HookTests.exe`. SmartScreen prevents you from running the executable. Click `More info`, `Run anyway`. - `HookTests.exe` launches and should show: `SUCCESS: The hook is installed`. - Open Firefox and navigate to `about:third-party`. You should see `HookLib.dll` listed. - In Firefox, click `Reload with system info`. A new button `Block this module` appears near `HookLib.dll`. Click it. Click `Restart Firefox now`. - When Firefox restarts, it should be extremely slow. If you can, navigate to `about:processes`, it should show that the main process and the GPU process together use around 100% of CPU. - Back in `HookTests.exe`, press ENTER, it should show: `SUCCESS: The hook is uninstalled`. Press ENTER again. - Back in Firefox, you should now experience normal performance. - Navigate to `about:third-party`. Click `Reload with system info`. Click the `Currently blocked` button near `HookLib.dll` to unblock the module. Click `Restart Firefox now`. Expected result: Once this bug is fixed, performing these steps should not result in bad performance at any point of Firefox use. The main process and the GPU process should not use 100% CPU together.
I created [a Github repository](https://github.com/yjugl/bug1823412) to share the reproducer. Steps to reproduce: - Install [the latest Microsoft Visual C++ Redistributable package for x64](https://aka.ms/vs/17/release/vc_redist.x64.exe). - Download `HookTests.exe` and `HookLib.dll` from [the release section of the repository](https://github.com/yjugl/bug1823412/releases/tag/v1.0). Keep them in the same folder. - (Recommended) Check integrity of the files from a Powershell window. The hashes on your computer should match: ``` PS > Get-FileHash .\HookTests.exe Algorithm Hash Path --------- ---- ---- SHA256 5EBEDD581258A1C29F4883B8B443C2B4EF86F442C0D53954AA6E4A8409DAB14D .\HookTests.exe PS > Get-FileHash .\HookLib.dll Algorithm Hash Path --------- ---- ---- SHA256 CC4509C7D621B0F69584FF7FB082C9DC63C178133D03ED362C713DAF065D7C56 .\HookLib.dll ``` - Double click on `HookTests.exe`. SmartScreen prevents you from running the executable. Click `More info`, `Run anyway`. - `HookTests.exe` launches and should show: `SUCCESS: The hook is installed`. - Open Firefox and navigate to `about:third-party`. You should see `HookLib.dll` listed. - In Firefox, click `Reload with system info`. A new button `Block this module` appears near `HookLib.dll`. Click it. Click `Restart Firefox now`. - When Firefox restarts, it should be extremely slow. If you can, navigate to `about:processes`, it should show that the main process and the GPU process together use around 100% of CPU. - Back in `HookTests.exe`, press ENTER, it should show: `SUCCESS: The hook is uninstalled`. Press ENTER again. - Back in Firefox, you should now experience normal performance. - Navigate to `about:third-party`. Click `Reload with system info`. Click the `Currently blocked` button near `HookLib.dll` to unblock the module. Click `Restart Firefox now`. Expected result: Once this bug is fixed, performing these steps should not result in bad performance at any point of Firefox use. The main process and the GPU process should not use 100% CPU together but have normal CPU usage.