You can add a Siteimprove browser extension to your preferred browser: https://www.siteimprove.com/why-siteimprove/integrations/browser-extensions/
Review your site's accessibility level by using Siteimprove to scan your site: https://it.cornell.edu/siteimprove
CIT has resources on how best to review your results, including tips on what each section that is reviewed means and how it should look/function: https://it.cornell.edu/accessibility/recommended-web-accessibility-testing-plan
Some key points are (from https://it.cornell.edu/accessibility/recommended-web-accessibility-testing-plan):
If you have questions about the issues that appear, you can reach out to CIT's Web Accessibility team: https://tdx.cornell.edu/TDClient/39/Portal/Requests/TicketRequests/NewForm?ID=qu8OaxDLTo4_&RequestorType=ServiceOffering