I had designed a Web App and tested on Firefox 18, 19, 20 and now when i'm checking it on 21 version it's not rendering properly. Now tell me what should i do.

I had designed a Web App and tested on Firefox 18, 19, 20 and now when I'm checking it on 21 version it's not rendering properly. Now tell me what should i do.

Hi charlesmoizeau, why do you want to install Firefox 18? To be compatible with a particular website or add-on? There might be a better workaround, but without the details, it's hard to say.
See this help article: [[Install an older version of Firefox]]. And be aware that Mozilla discloses [https://www.mozilla.org/security/known-vulnerabilities/firefox.html security flaws] after each new release.

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