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have been using firefox for several years, but now not loading.

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Mac iOS-i have been using firefox for years. now it is not loading. i have deleted files on 'applications', but still getting message, " Close firefox. a copy of firefox is already open. Only one copy of Firefox can be open at a time." I have done a search for all copies of files on applications and finder, but there seem to none. Thanks

Mac iOS-i have been using firefox for years. now it is not loading. i have deleted files on 'applications', but still getting message, " Close firefox. a copy of firefox is already open. Only one copy of Firefox can be open at a time." I have done a search for all copies of files on applications and finder, but there seem to none. Thanks

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Try opening "Activity Monitor" and looking for firefox and closing it from there, then try reopening it