I frequently use:

Gmail.com
Dictionary.com

Yes,

Close all tabs
Open Gmail
Open Dictionary in a new tab
Save the session:
Sessions => Save the session => give a name.
You can then change the homepage and set it to your saved session
Display => Homepage => Start with the session

If you don't want it as homepage, you can call it during a session:
Session => Open a Session
In this case when launching the session, all the already opened tabs are closed.

A+

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Mozilla/5.0 (x11; U; Linux x86_64; en-US; rv:1.9.1.17pre) Gecko/20101211 Ubuntu/12.04 (precise) K-Meleon/1.6.0
Mozilla/5.0 (x11; U; Linux x86_64; fr-FR; rv:1.9.2.14pre) Gecko/20101219 Ubuntu/12.04 (precise) K-Meleon/1.7.0

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Web: K-Meleon Extension Setup (French) and (English)
Web: http://jujuland.pagesperso-orange.fr/
Mail : alain [dot] aupeix [at] wanadoo [dot] fr

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Edited 1 time(s). Last edit at 11/27/2011 04:38AM by JujuLand.

I use dictionary.com a lot and keeping javascript disabled sure helps speed it up.

Furthermore, I block ad and tracking hosts with my hosts file but I've also developed some special css to hide things like the ad blocks and other visual garbage at the site (not a speed improvement, just visual).

Click
Edit -> Configuration -> User-Defined StyleSheet
and then paste the following mess of code into it to make the pages look much better and tighter. Note: reference.com covers dictionary.com, and there is no guarantee that all of the named elements are still in use nor any guarantee that it won't hide something you might want to see, but it's worth trying, I love it.

@-moz-document domain("reference.com") {
body div[id="fcrds"] {display: none !important; visibility: hidden !important;}
body div[id="bnrTop"] {display: none !important; visibility: hidden !important;}
body div[class="banner-ad"] {display: none !important; visibility: hidden !important;}
body div[class="banner-ad bnr"] {display: none !important; visibility: hidden !important;}
body div[id="dcomad_728x90"] {display: none !important; visibility: hidden !important;}
body div[class="spl_unshd"] {display: none !important; visibility: hidden !important;}
body div[class="sep_top bottomAd"] {display: none !important; visibility: hidden !important;}
body div[id="nfotr"] {display: none !important; visibility: hidden !important;}
body div[id="sftr"] {display: none !important; visibility: hidden !important;}
body div[id="skyAd"] {display: none !important; visibility: hidden !important;}
body div[id="promo_serpTo"] {display: none !important; visibility: hidden !important;}
body div[class="lr_skyad"] {display: none !important; visibility: hidden !important;}
body div[id="footer"] {display: none !important; visibility: hidden !important;}
body div[class="sftr"] {display: none !important; visibility: hidden !important;}
body div[class="sftc"] {display: none !important; visibility: hidden !important;}
body div[class="ftwr"] {display: none !important; visibility: hidden !important;}
body div[class="sT shd_hdr hbpad"] {display: none !important; visibility: hidden !important;}
 }