You could have supplied more information as did not say what Version or Firefox as there are 3 for Windows.

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Current Release Firefox 57.0.3 with a Full Version Installer

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

After install : go to the Firefox 3 Bar Menu --> Options --> Privacy & Security panel and under Permissions check the setting to Prevent Accessibility Services from accessing your browser. or 52.5.3 ESR. It will continue to get security updates until May 2018, and you can download and install it from this page:

• https://www.mozilla.org/en-US/firefox/organizations/all/

Note : Legacy Extensions will be deleted or removed in any version update after May 2018.

• https://addons.mozilla.org/en-US/firefox/extensions/

Please let us know if this solved your issue or if need further assistance.

sagargawle said

cant install new firefox in my windows 7

Firefox from www.mozilla.org should serve a online stub installer that should install the 32-bit version since you appear to have 32-bit Windows 7.

You can also download the full 32-bit setup version for Windows from www.mozilla.org/firefox/all/

The 64-bit version for Windows requires 2+GB RAM and 64-bit Windows 7, 8, 10.