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What Firefox version should I install on Win7 (32-bit) system which does NOT support SSE2?

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Upgrades to current Firefox version won't install because of processor inadequacy. Firefox version which DID work has been corrupted by upgrade process and no longer does. Need to reinstall an older Firefox version which will work ... and is the most up-to-date ... for a processor which does not support SSE2. Thanks!

Upgrades to current Firefox version won't install because of processor inadequacy. Firefox version which DID work has been corrupted by upgrade process and no longer does. Need to reinstall an older Firefox version which will work ... and is the most up-to-date ... for a processor which does not support SSE2. Thanks!

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Is it the problem described in this article: Your hardware is no longer supported?

The "Extended Support Release" version of Firefox 45 can be downloaded from the following page (scroll down to your preferred language):

https://www.mozilla.org/firefox/organizations/all/

I assume you have been using a regular 32-bit version and not the more limited 64-bit version. On the download page, that's the one for "Windows" and NOT "Windows 64-bit".