pressing button "write window" is making a new window containing the plain text .. this is a plain text written by makeProt(called by frame ). "view page source" is in fact responding with this text: this is a plain text written by makeProt(called by frame ). Saving of this protocol file will attempt to save a file "index" - and isn't saving anything. MINEFIELD 3.0a5: this source file was unreadable in the default view format because of FF-chars (form feed). necessary: reload. Trying to save this corrected file: same as before (file "index", not saved). (firefox 2.0 is showing blanks instead of FFs) Increasing/decreasing char size without function. not defined, but used: http://www.mozilla.org/projects/firefox/3.0a5pre/releasenotes/ But "view page info" is answering: Address: file:///own/kohl/Foot18/frage/called.xml and "save page as" is indeed saving a copy of the file called.xml Reloading this page: the plain text is evaluated as HTML source title of the 'reloaded' page: "this is a plain text" content of the 'reloaded' page: "written by makeProt(called by frame )." Saving of this page: - again saving called.xml (I think I've seen that frequently and just in the moment, but ... I'm a bit confused now ...) - or saving called.xml.html containing e.g. this is a plain text written by makeProt(called by frame ). "view page source" is in fact responding with this text: this is a plain text written by makeProt(called by frame ). - but saving this page is now generating the 16bit encoded file called.xml.html - or the file index (no saving!) containing the html text: this is a plain textwritten by makeProt(called by frame ). reloading of "this is a plain text" while the source file is open may give the nice effect: Security Error: Content at wyciwyg://42/file:///own/kohl/Foot18/frage/called.xml may not load or link to file:///own/kohl/Foot18/frage/called.xml. When seeking for the protocol file, I've accidently found a new file 'mop4' Adobe file created by cairo 1.4.2 in my home dir, see appended files