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Download action changeing by itself

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kinglumus1
kinglumus1
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For some reason my default PDF reader keeps being changed to MS Office instead of just opening them in the browser as I directed. I keep having to change the setting in Firefox every couple of weeks (general > applications > PDF). What's causing this?

For some reason my default PDF reader keeps being changed to MS Office instead of just opening them in the browser as I directed. I keep having to change the setting in Firefox every couple of weeks (general > applications > PDF). What's causing this?

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kinglumus1
kinglumus1 Pemilik Soalan
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(Sorry for the late response, Gmail marked it as spam)

My system default is Office 365. Would the system settings change the browser setting, though?