Firefox.exe has "disappeared" so I can't open it. If I download and install new version will I lose all my bookmarks etc?

I've had a lot of crashes, some just firefox, some the whole computer. In process of migrating to new machine so wasn't overly concerned. But after a restart today, I found I could not get firefox to open at all. After finding the system searching for firefox.com, I checked program files\mozilla firefox and firefox.exe is not there. A search showed it not to be anywhere. Not ready to stop using this machine just yet. Any way to get firefox.exe reloaded without losing all my related stuff??

As long as you do not delete your Firefox personal settings or application data, they should remain after a reinstall.
Don't run the Firefox uninstaller, simply run the installer that you download. This will just install over your previous installation.
<b>Note:</b> To be 100% safe, I would recommend backing up your Firefox application data folder.

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