Hi. I updated from 4 to 5 and nothing work. I lost anu addons. When could I take version 4?

On 4.0 everything was working. Now - antivirus, downloaders don't work. How could I change version to 4 from 5?

Due to security vulnerabilities, rolling back to Firefox 4.0.1 is not recommended.
If Firefox disabled some add-ons (especially extensions), it likely is because they include a list of compatible Firefox versions and haven't yet been updated for Firefox 5. If they worked on Firefox 4, there is a good chance they will actually work on Firefox 5.
You can force Firefox to ''ignore'' add-on version restrictions by (what else) installing an add-on. Then you can test whether the add-ons important to you actually work in Firefox 5.
[https://addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/ Add-on Compatibility Reporter :: Add-ons for Firefox]
After you install it and restart Firefox, a new control should appear next to each add-on that lets you manage it individually.
Does it work?

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