Browser freezes and all tab contents turn black when switching tabs on Windows

### Preliminary Checks - [x] I have read and understood the important section above. - [x] I have searched existing issues and avoided creating duplicates. - [x] I am not filing an enhancement request. - [x] I have checked that this issue cannot be reproduced on Mozilla Firefox. - [x] I have checked that this issue can be reproduced once I removed all my Mods and Custom CSS. ### What happened? Zen Browser frequently freezes on my notebook. When I try to switch tabs, the content area of the browser turns completely black/blank and the tabs stop responding properly. The browser UI remains visible, but the page contents disappear. When I click or switch between tabs, nothing changes and the content is not rendered anymore. The only workaround I have found so far is to restart the browser. This happens repeatedly during normal usage, not only on a specific website. ### Expected behavior When switching tabs, Zen should render the selected tab normally and the browser should remain responsive. ### Actual behavior After switching tabs, the page area becomes black/blank and Zen stops updating the tab contents. ### Environment - Zen Browser version: 1.21.5b - Firefox engine version shown: Firefox 152.0.4 - Architecture: 64-bit - OS: Windows 64-bit - Device name: xeon - CPU: Intel Xeon W-10855M @ 2.80 GHz - RAM: 64 GB - GPU 1: NVIDIA Quadro T1000, 4 GB - GPU 2: Intel UHD Graphics P630 - Storage: 432 GB used of 477 GB ### Steps to reproduce 1. Open Zen Browser normally. 2. Keep multiple tabs open. 3. Use the browser for some time. 4. Switch between tabs. 5. Eventually, the page content turns completely black/blank. 6. Switching tabs does not restore the content. ### Additional information This may be related to rendering, GPU acceleration, or tab/workspace handling. I can provide logs or test a debug build if needed. ### Expected behavior When switching between tabs, Zen Browser should keep the browser responsive and render the selected tab content normally. ### Actual behavior When I switch between tabs, the browser often freezes and the page/content area becomes completely black or blank. The browser UI is still visible, but the tab contents disappear and switching tabs does not update or restore the page. I usually need to restart the browser to make it work again. ### Steps to reproduce 1. Open Zen Browser on Windows. 2. Open multiple tabs. 3. Use the browser normally for some time. 4. Switch between tabs. 5. At some point, the page/content area turns black or blank. 6. After that, switching tabs does not restore the content and the browser becomes unusable until restarted. ### Screenshots and videos _No response_ ### Version 1.21.5b ### What platform are you seeing the problem on? Windows - x64 ### What component is this issue related to? Workspaces ### Relevant log output if applicable ```shell No relevant logs available yet. ```