Here are the results about our experiments with, and readings about various browsers:
Browser
overall rating
Security Browsing Portability
Netscape 4.08
Netscape 4.7
  • Resizing the window will force reloading the page, so discard any not yet submitted change.
  • Pressing the back button will reload the window, so loose time.
Mozilla 0.9.8
or later
  • Slow, but works fine.
  • Mozilla is both very secured and reliable.
Netscape 6
  • Same as Mozilla ...
  • ... but probably with additional code spying you: rather use Mozilla.
Galeon
  • Same as Mozilla.
  • I have not noticed it to be significantly faster or lighter than Mozilla.
IE 5
  • Automatic reloading of the page does not work (probably fatal).
IE 5.5 Needs to retested against the latest Pliant code.
IE 6 Needs to retested against the latest Pliant code.
Konqueror 2.2
  • Events handling works poorly (we probably have to wait for a more mature version).
  • The screen is flickering because Konqueror starts displaying the page too early, and does not clear the window directly with the right ground color.
Opera 5.0.1
  • Automatic reloading of the page does not work (probably fatal).
  • 'deflate' compression is buggy (we have a workaround for that).
Opera 6.0
  • Modifying database fields does not work (workaround expected).
  • Files uploading does not work (workaround expected).
  • 'deflate' compression is buggy (we have a workaround for that).
Security:
  This browser is protecting your privacy.
  Big brother is probably watching you.
Browsing capabilities:
  Basically works fine.
  Ok for occasional access to basic Pliant applications (database).
  Don't use this browser: there are far better ones available.
Portability:
  Works on nearly all plateforms.
  Works only on some plateforms.

If you have a powerful computer (750 MHz or faster processor and 128 MB or more RAM), then use Mozilla because it's very reliable, secure and it will probably behave best for future applications relying on DOM and SVG.
For a smaller computer, the best choice is Netscape 4 or IE 6. Neither of these can be trusted from a security point of view.
We might find at a later point some workarounds for Opera 6 which is interesting because of its speed.