If you've installed the Group Speed Dial extension but it's not opening when you open a new tab in Google Chrome, here are a few things you can try:
Check if the extension is enabled: Click on the three dots in the top right corner of your Chrome browser and go to "More tools" > "Extensions". Find the Group Speed Dial extension and make sure it's enabled.
Check the extension's settings: Click on the extension icon in your Chrome toolbar and click on the gear icon to access the extension settings. Make sure the "New tab" option is enabled and that the "Show on startup" option is also checked.
Clear your browser cache: Sometimes clearing your browser's cache can resolve issues with extensions not working properly. You can clear your cache by clicking on the three dots in the top right corner of your Chrome browser and going to "More tools" > "Clear browsing data".
Try disabling other extensions: Sometimes conflicts can occur between different extensions. Try disabling other extensions one by one to see if that fixes the issue.
If none of these solutions work, you can try contacting the developer of the Group Speed Dial extension for further assistance.