Search Open Tabs
I found an article https://support.mozilla.org/en-US/kb/search-open-tabs-firefox but I don't see the open tabs icon even when I open many tabs and have more than one Firefox window with tabs. I find this feature in Chrome very helpful and was hoping Firefox would have something comparable or better.
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You can set browser.tabs.tabmanager.enabled = true on the about:config page to have the "List all tabs" button permanently visible at the right end of the Tab bar.
You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.
WARNING: Changing preferences through this interface not officially supported Hidden settings edited using the about:config tool are explicitly not supported, which means that Mozilla makes no guarantees they will be supported in the future, or that Mozilla will fix them if they break. Mozilla does not test these preferences, and will not in the future. That includes security and performance testing which these preferences may affect.