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why does Mozilla open when I open a Tiff file in Photoshop?

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Ever since I started using Photoshop CS5 in 64-bit, I noticed that every time I double click to open a .TIFF file in Bridge, Firefox opens and puts the image file name in the address bar. Photoshop continues to open also, but why is Firefox opening? I have already changed in the Tools>Options>Applications so that image/tiff files open in PS CS5. So why does Firefox open?

Ever since I started using Photoshop CS5 in 64-bit, I noticed that every time I double click to open a .TIFF file in Bridge, Firefox opens and puts the image file name in the address bar. Photoshop continues to open also, but why is Firefox opening? I have already changed in the Tools>Options>Applications so that image/tiff files open in PS CS5. So why does Firefox open?

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What's the file association set to for the TIFF extension in the Windows Control Panel > Folder Options > File Types ?

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The Tiff files were assigned Windows File Viewer and the Jpegs were assigned "unknown". I changed them all to Photoshop and it seems to be working the way it should now. Thanks for the help. Glad I was on the right path!