On many Linux distributions by default there is only Firefox 3.6. However, when I try to install Convergence I get:
How can I install Convergence on a distro that runs Firefox 3.6 (e.g. Scientific-Linux 6.1 or Ubuntu 10.04 LTS)?
According to this: FF Version Compatibility Info Needed, you can't run that add-on on Firefox 3.6. You'll need to get Firefox 4 or above.
It's never recommended to use an outdated web-browser, because of security concerns. You obviously could recompile the source, specifically you would need to edit
But It goes without saying, rigging the extension to run on a considerably outdated browser is not the best solution. It might not even be possible, if any required features are absent in 3.6. In regards to Ubuntu 10.04 LTS, a good Mozilla Team PPA exists, you can install the newest stable Firefox simply.
Open the terminal with Applications → Accessories → Terminal., and then run these commands.
If you want to update Firefox on Scientific Linux 6.1, I'm not informed of the automated methods. Although, firefox is distributed compiled, so you just need to install it from a .tar.gz. Another user posted about his update at Are there any fresh versions of Firefox for Scientific-Linux [or RHEL] available offically?