GitLab MergeButton Control is a Chrome add-on developed by ryota.onishi. It falls under the category of Browsers and the subcategory of Add-ons & Tools. This free software is designed to disable the "Accept Merge Request" button on GitLab's merge request page when LGTM (Looks Good To Me) or +1 is not present.

With GitLab MergeButton Control, users can ensure that merge requests are only accepted when they have received the necessary approvals. By disabling the merge button when LGTM is missing, it helps enforce the code review process and prevents accidental merges.

This add-on is compatible with GitLab versions 7.9 and 8.11, providing users with a convenient way to enhance their code review workflow on the popular GitLab platform.