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how to remove overwrite when typing?

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Anytime I type text, the written text gets deleted or overwritten at times. I have pressed the insert key to no avail. Is there any other solution available?

Anytime I type text, the written text gets deleted or overwritten at times. I have pressed the insert key to no avail. Is there any other solution available?

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Insert can be finicky. Can you turn overwrite on and off in other programs with the Insert key?

Does the issue persist in Firefox's Safe Mode? https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode#w_how-to-start-firefox-in-safe-mode