Hi Olivier,
this is not the solution: you can try by yourself directly opening the .src file in your Firefox
searchplugins folder, modify the text within the
name tag using some HTML entities e.g.
& and then closing&(re)opening Firefox.
I'd suggest you to try firstly to check your webserver configuration and then try what written below.
The real solution seems to be quite complex and not always applicable: in the
pmfsearch.src file, you could specify the
sourceTextEncoding tag with an integer representing the encoding with which you have written the text value e.g. for the
name tag. Unfortunately this integer does not map the whole of the charsets. You could take a look at this incomplete map in
InternetSearchDataSource::MapScriptCodeToCharsetName and search for a match.
Currently the PMF Firefox Search Plugin is a trade-off for best fitting in most of the cases.
Regards,
Matteo