Browser.sessionhistory.max total viewers

From MozillaZine Knowledge Base

The title given to this article is incorrect due to technical limitations. The correct title is browser.sessionhistory.max_total_viewers.

This article describes the preference browser.sessionhistory.max_total_viewers. To add, delete, or modify this preference, you will need to edit your configuration — do not edit this article.

1 Background
2 Possible values and their effects
3 Caveats
4 Recommended settings
5 First checked in
6 Has an effect in
7 Related bugs

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Background

Pages that were recently visited are stored in memory in such a way that they don't have to be re-parsed (this is different from the memory cache). This improves performance when pressing Back and Forward.

This preference limits the maximum number of pages stored in memory.

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Possible values and their effects

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-1

Automatically determine the maximum amount of pages to store in memory based on the total amount of RAM (Default)

RAM	Pages
32MB	0
64MB	1
128MB	2
256MB	3
512MB	5
1GB	8
2GB	8
4GB	8

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0

Do not store any pages in memory.

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Any positive integer

Maximum number of pages to store in memory.

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Caveats

Lowering this value causes less memory to be used but also causes more previously visited pages to have to be re-parsed (thus increasing their load time). Raising it has the opposite effect. One page will on average take 4MB of memory.

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Recommended settings

Users who are having problems with memory consumption can try setting the value to something lower than specified in the table above to lower memory consumption. Users who have no problems with memory should leave it at -1.

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