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New to Firefox: How do I tab focus into non-text fields?

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Hi, when I tab while in a webpage, the focus only cycles through text fields and checkboxes, but not dropdowns.

Hi, when I tab while in a webpage, the focus only cycles through text fields and checkboxes, but not dropdowns.
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I'm not sure why this is different between Windows and Mac. On Mac, this should follow a system setting called "Full Keyboard Access." If that isn't working, you can override it by changing this preference. I think.

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(2) In the search box in the page, type or paste accessibility.tabfocus and pause while the list is filtered

(3) Double-click the preference to display an editing field, and change the value to the preferred number (see below) then press Enter or click the blue check mark button to save the change.

Possible values and resulting behavior:

ValueText FieldsOther FieldsLinksNote
1YesNoNotext fields only - MacOS default
2NoYesNo-
3YesYesNoall form controls
4NoNoYeslinks only
5YesNoYes-
6NoYesYes-
7YesYesYeseverything - Windows/Linux default