Hello,
TenFourFox is the most up to date browser for our PPCs, they even have G4 & G5 optimized versions...
http://www.floodgap.com/software/tenfourfox/
SeaMonkey seems pretty fast also, with many options...
http://www.seamonkey-project.org/
http://www.seamonkey-project.org/releases/
Flash is a nightmare, but my notes on that...
Look for this for the Standalone player "Download the Macintosh Flash Player 10 Projector content debugger (ZIP, 5.95 MB)"
http://www.adobe.com/support/flashplayer/downloads.html
You should first uninstall any previous version of Flash Player, using the uninstaller from here (make sure you use the correct one!):
http://kb2.adobe.com/cps/865/cpsid_86551.html#prob1=uninst,os=m10.6,
Download this if you haven't...
http://fpdownload.macromedia.com/get/flashplayer/installers/archive/fp10.1.102.6 4_and_9.0.289.0archive.zip
Once downloaded if it doesn't unzip automatically the double click on that file.
Look for the fp10.1.102.64_and_9.0.289.0archive folder, open it, look for the Flash Player 10.1.102.64 folder & open and look for 101r10264 folder & open it, double click on the flashplayer101r102_64_ubmac.dmg file, choose the Install Adobe Flash Player file to install... they don't make it easy! 😟
Or I put up the smaller ones here...
http://dl.dropbox.com/u/450421/flashplayer10_1r82_76_ub_mac%20copy.dmg.zip
Stand alone player...
http://dl.dropbox.com/u/450421/LastFlashPPC.zip
Or free 3rd party...
http://www.wimpyplayer.com/products/wimpy_standalone_flv_player.html
The last really supported Flash for PPC was 10.1.102.64, but if it's for like Facebook or such, people have been fooling FB to think they have a leter version installed.
Texas Mac Man's Flash hack/post...
https://discussions.apple.com/thread/3599648?tstart=0
Flash player 11.1 hack on PowerPC - https://discussions.apple.com/thread/3558589?answerId=16990862022#16990862022
Might be later ones around also... saw 11.3 I think.
(If you are running a PPC Mac with Flash Player 10.1.102.64 and are having problems with watching videos on FaceBook or other sites, contributor Texas Mac Man suggests the following solution which fools the site into thinking that you are running the latest version:)
Download this http://www.steelbin.com/FPforFBPPC.zip to your desktop, unzip it, and replace the current Flash Player plug-in which is in your main/Library/Internet Plug-Ins folder, (not the user Library). Save the old one just in case this one doesn't work.